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1. lamella (2) 2. In dentistry, a circular piece of thin paper or other material, coated with an abrasive substance, used for cutting and polishing teeth and fillings. [L. discus; G. diskos, a quoit, disk]
A d.'s A bands, under band
acromioclavicular d. articular disc of acromioclavicular joint
anisotropic d.'s A bands, under band
articular d. articular disc
articular d. of temporomandibular joint the fibrocartilaginous plate that separates the joint into upper and lower cavities.discus articularis temporomandibularis [NA] , mandibular d., temporomandibular articular d;
blastodermic d. the aggregation of blastomeres of a telolecithal ovum after cleavage has occurred.
blood d. platelet
Bowman's d.'s d.'s resulting from transverse segmentation of striated muscular fiber treated with weak acids, certain alkaline solutions, or freezing.
Burlew d. an abrasive-impregnated rubber wheel used in dentistry for polishing.Burlew wheel;
choked d. papilledema
ciliary d. orbiculus ciliaris
cone d.'s membranous d.'s of flattened sacs about 14 nm thick that occur in the outer segment of cones of the retina.
cuttlefish d. a circle of paper or thin plastic coated with ground cuttlefish bone; used, when attached to a mandrel and rotated by a dental handpiece, for fine smoothing and finishing of dental materials and tooth.
diamond d. a steel d. with the cutting surface(s) covered with fine diamond chips, for use in a dental handpiece.
embryonic d. germinal d
emery d.'s d.'s of paper or other materials coated with emery powder used to abrade or smooth the surface of teeth or fillings.
germinal d. , germ d. the point in a telolecithal ovum where the embryo begins to be formed.embryonic d., germinal area, area germinativa;
H d. H band
hair d. a richly innervated area of skin around a hair follicle, consisting of a thickened layer of epithelial cells in which ramify unmyelinated terminals of a single axon.
Hensen's d. H band
herniated d. protrusion of a degenerated or fragmented intervertebral d. into the intervertebral foramen with potential compression of a nerve root or into the spinal canal with potential compression of the cauda equina in the lumbar region or the spinal cord at higher levels.protruded d., ruptured d;
I d. I band
intercalated d. a specialized intercellular attachment of cardiac muscle comprising gap junctions, fascia adherens, and occasionally desmosomes.
intermediate d. Z line
interpubic d. interpubic disc
intervertebral d. intervertebral disc
isotropic d. I band
mandibular d. articular d. of temporomandibular joint
Merkel's tactile d. tactile meniscus
Newton's d. a d. on which are seven colored sectors, each occupying proportionally the same space as the corresponding primary color in the spectrum; when the disk is rapidly rotated it appears white.
optic d. an oval area of the ocular fundus devoid of light receptors where the axons of the retinal ganglion cell converge to form the optic nerve head;discus nervi optici [NA] , blind spot (3) , Mariotte's blind spot, optic nerve head, optic papilla, papilla nervi optici, porus opticus;
Placido da Costa's d. keratoscope
proligerous d. cumulus oöphorus
protruded d. herniated d
Q d.'s A bands, under band
radioulnar d. , radioulnar articular d. articular disc of distal radioulnar joint
Ranvier's d.'s tactile nerve endings, of cupped disklike form, in the skin.
rod d.'s membranous d.'s of flattened sacs about 14 nm thick that occur in the outer segment of rods of the retina.
ruptured d. herniated d
sandpaper d.'s d.'s of paper coated with various grits of silica; used to abrade or smooth the surface of teeth or dental materials.
stenopeic d. , stenopaic d. a metallic or other opaque d. with a narrow slit through which one looks; used as a test for astigmatism.
sternoclavicular d. , sternoclavicular articular d. articular disc of sternoclavicular joint
stroboscopic d. a revolving d. that gives successive views of a moving object.
tactile d. tactile meniscus
temporomandibular articular d. articular d. of temporomandibular joint
transverse d. one of the dark transverse bands seen on examining a striated muscular fiber under the microscope.
triangular d. of wrist articular disc of distal radioulnar joint
Z d. Z line
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