preparation (prep-a-ra´shun)

1. A getting ready. 2. Something made ready, as a medicinal or other mixture, or a histologic specimen. [L. praeparatio, fr. prae, before, + paro, pp. -atus, to get ready]
cavity p. 1. removal of dental caries and surgical p. of the remaining tooth structure to receive a dental restoration; 2. the final form of an excavation in a tooth resulting from such p.
corrosion p. a p. in which the hollow parts such as ducts, vessels, or alveoli of the lung are filled with a substance that hardens and persists after dissolving the tissues by digestion.
cytologic filter p. a cytologic specimen made by depositing a watery sample (obtained by a variety of methods from many body sites) upon a filter having pores of uniform size smaller than the cellular material to be concentrated; this is followed by fixation and staining, usually with 95% ethyl alcohol and Papanicolaou stain.
heart-lung p. an animal p. in which blood (rendered incoagulable) circulates through the heart and lungs and through an artificial system of vessels representing the systemic circulation; the latter is connected with the divided aorta on the one hand and with the superior vena cava on the other; used in physiologic studies of the heart and circulation.


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