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1. punctum 2. A sharp end or apex. 3. A slight projection. 4. A stage or condition reached, as the boiling p. 5. To become ready to open, said of an abscess or boil the wall of which is becoming thin and is about to break. [Fr.; L. punctum, fr. pungo, pp. punctus, to pierce]
p. A subspinale
absorbent p.'s cones of paper or paper products used for drying or maintaining medicaments during root canal therapy.
alveolar p. prosthion
anterior focal p. the p. where parallel rays from the retina are focused.
apophysary p. , apophysial p. 1. subnasal p 2. Trousseau's p
auricular p. auriculare
axial p. nodal p
p. B supramentale
boiling p. (b.p.) the temperature at which the vapor pressure of a liquid equals the ambient atmospheric pressure.
Cannon's p. the location in the mid-transverse colon at which innervation by superior and inferior mesenteric plexuses overlap at the junction of the primitive midgut and hindgut, frequently resulting in narrowing evident on barium enema. See Cannon's ring.Cannon's ring;
Capuron's p.'s the iliopubic eminences and the sacroiliac joints, constituting four fixed p.'s in the pelvic inlet.
cardinal p.'s 1. the four p.'s in the pelvic inlet toward one of which the occiput of the baby is usually directed in case of head presentation: two sacroiliac articulations and the two iliopectineal eminences corresponding to the acetabula; 2. six p.'s of a compound optical system: the anterior focal p., the posterior focal p., the two principal p.'s, and the two nodal p.'s.
central-bearing p. the contact p. of a central-bearing device.
Clado's p. a p. at the junction of the interspinous and right semilunar lines, at the lateral border of the rectus abdominis muscle, where marked tenderness on pressure is felt in some cases of appendicitis.
cold-rigor p. the degree of lowered temperature at which the activity of a cell ceases and the cell passes into the narcotic or hibernating state.
congruent p.'s the p. in each retina referred to the same external stimulus.
conjugate p. a p. so related to another that an object at one is imaged at the other.
contact p. contact area
p.'s of convergence See convergence.
craniometric p.'s fixed p.'s on the skull used as landmarks in craniometry.
critical p. a p. at which two phases become identical; thus, at a given critical temperature and critical pressure, the liquid and gaseous state of a particular substance can no longer be differentiated.
dew p. the temperature at and below which moisture will condense for a specific humidity.
p. of elbow olecranon
end p. the completion of a reaction; usually evident by the first perceptible alteration of the color of an added indicator.
equivalence p. equivalence zone
far p. that p. in conjugate focus with the retina when the eye is not accommodating.punctum remotum;
p. of fixation the p. on the retina at which the rays coming from an object regarded directly are focused.p. of regard;
flash p. the lowest temperature at which vapors of a liquid may be ignited by a flame.
focal p. See anterior focal p., posterior focal p.
freezing p. the temperature at which a liquid solidifies.
fusing p. See fusion temperature (wire method).
Guéneau de Mussy's p. a p., painful on pressure, at the junction of a line prolonging the left border of the sternum and a horizontal line at the level of end of the bony portion of the tenth rib; it is present in cases of diaphragmatic pleurisy.
gutta-percha p.'s cones of a gutta percha compound used for filling root canals in conjunction with a cement, paste, or plastic.
Hallé's p. a p. at the intersection of a horizontal line touching the anterior superior spine of the ilium and a perpendicular line drawn from the spine of the pubis; here the ureter can be most readily palpated.
heat-rigor p. the degree of elevated temperature at which coagulation of protoplasm occurs with death of the cell.
incident p. the p. at which a light ray enters an optical system.
incisal p. the p. located between the incisal edges of the lower central incisors; the graphic projection of the excursions of the incisal p. in certain planes is generally used to illustrate the envelope of motion of mandibular movement.
isoelectric p. (I.P., i.p., pI) the pH at which an amphoteric substance, such as protein or an amino acid, is electrically neutral.
isoionic p. the pH at which a zwitterion has an equal number of positive and negative charges; in water and in the absence of other solutes, this is the isoelectric p.
isosbestic p. in applied spectroscopy, a wavelength at which absorbance of two substances, one of which can be converted into the other, is the same.
J p. the p. marking the end of the QRS complex and the beginning of the S or T wave in the electrocardiogram.ST junction;
jugal p. jugale
lower alveolar p. infradentale
malar p. apex of the tuberosity of the zygomatic (malar) bone.
p. of maximal impulse the p. on the chest wall at which the maximal cardiac impulse is seen and/or felt.
maximum occipital p. the p. on the squama of the occipital bone farthest from the glabella.
Mayo-Robson's p. a p. just above and to the right of the umbilicus, where tenderness on pressure exists in disease of the pancreas.
McBurney's p. a p. between 11 / 2 and 2 inches superomedial to the anterior superior spine of the ilium, on a straight line joining that process and the umbilicus, where pressure elicits tenderness in acute appendicitis.
median mandibular p. a p. on the anteroposterior center of the mandibular ridge in the median sagittal plane.
melting p. (m.p., IEP, Tm) 1. the temperature at which a solid becomes a liquid; 2. the temperature at which 50% of a macromolecule becomes denatured.
mental p. pogonion
metopic p. metopion
motor p. a p. on the skin where the application of an electrical stimulus, via an electrode, will cause the contraction of an underlying muscle.
Munro's p. a p. at the right edge of the rectus abdominis muscle, between the umbilicus and the anterior superior spine of the ilium, where pressure elicits tenderness in appendicitis.
nasal p. nasion
near p. that p. in conjugate focus with the retina when the eye exerts maximal accommodation.punctum proximum;
neutral p. the p. at which a solution is neither acid nor alkaline (pH 7 at 22°C for aqueous solutions).
nodal p. one of two p.'s in a compound optical system so related that a ray directed toward the first p. will appear to have passed through the second p. parallel to its original direction.axial p;
occipital p. the most prominent posterior p. on the occipital bone above the inion.
p. of ossification center of ossification
painful p. See Valleix's p.'s.
posterior focal p. the p. of a compound optical system where parallel rays entering the system are focused.
power p. in dentistry, the vertical dimension at which the greatest masticatory force may be registered.
preauricular p. a p. of the posterior root of the zygomatic arch lying immediately in front of the upper end of the tragus.
pressure p. a cutaneous locus having pressure-sensitive elements which when compressed, pressure is appreciated.
primary p. of ossification primary center of ossification
principal p. one of two p.'s on an optic axis so related that an object at one is exactly imaged at the other without magnification, minification, or inversion.
p. of proximal contact contact area
p. of regard p. of fixation
retention p. a provision made within a cavity preparation of a tooth to hold in place the first pieces of gold when placing a direct gold restoration.
secondary p. of ossification secondary center of ossification
silver p. a solid core cone of silver used in filling root canals in conjunction with a cement or paste.
spinal p. subnasal p
subnasal p. the center of the root of the anterior nasal spine.apophysary p. (1), apophysial p., spinal p;
Sudeck's critical p. region in the colon between the supply of the sigmoid arteries and that of the superior rectal artery.
supra-auricular p. a craniometric p. on the posterior root of the zygomatic process of the temporal bone directly above the auricular p.
supranasal p. ophryon
supraorbital p. ophryon
sylvian p. the nearest p. on the skull to the lateral (sylvian) fissure, about 30 mm behind the zygomatic process of the frontal bone.
tender p.'s Valleix's p.'s
trigger p. a specific p. or area where, if stimulated by touch, pain, or pressure, a painful response will be induced.dolorogenic zone, trigger area, trigger zone;
triple p. the temperature at which all three phases (i.e., solid, liquid, and gas) are in equilibrium; the triple p. of water (273.16 K) is a fundamental fixed point in temperature scales.
Trousseau's p. a painful p., in neuralgia, at the spinous process of the vertebra below which arises the offending nerve.apophysary p. (2), apophysial p;
Valleix's p.'s various p.'s in the course of a nerve, pressure upon which is painful in cases of neuralgia; these p.'s are: 1) where the nerve emerges from the bony canal; 2) where it pierces a muscle or aponeurosis to reach the skin; 3) where a superficial nerve rests upon a resisting surface where compression is easily made; 4) where the nerve gives off one or more branches; and 5) where the nerve terminates in the skin.tender p.'s;
Weber's p. a p. situated 1 cm below the promontory of the sacrum; believed by Weber to represent the center of gravity of the body.
zygomaxillary p. zygomaxillare
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