p
symbol for (1) the short arm of a chromosome; or (2) the frequency of the more common allele of a pair; (3) pico-.
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p-
symbol, para-.
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P mitrale
an electrocardiographic abnormality in which the P wave is prolonged, in dogs more than 0.04 s. Associated with left atrial enlargement.
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P pulmonale
an electrocardiographic abnormality in which the P wave is tall and peaked. Indicative of right atrial enlargement which is often associated with chronic pulmonary disease.
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P site
see peptidyl-tRNA binding site (under trna).
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p.c.
[L.] post cibum (after meals).
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p.r.n.
[L.] pro re nata (according to circumstances).
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p.s.i.
pounds per square inch, equivalent to one-seventh of a kilopascal (kPa), the metric measure of pressure.
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P1
parental generation.
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P2
pulmonic second sound. See heart sounds.
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