preparation

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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prep·a·ra·tion .prep-ə-'rā-shən n

1) the action or process of preparing

2) something that is prepared specif a medicinal substance made ready for use <a \preparation for colds>

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prep·a·ra·tion (prep″ə-raґshən) [L. praeparatio] 1. the act or process of making ready. 2. a medicine made ready for use. an anatomic or pathologic specimen made ready and preserved for study.