Pear(pr), n. [OE. pere, AS. peru, L. pirum: cf. F. poire. Cf. Perry.] (Bot.) The fleshy pome, or fruit, of a rosaceous tree (Pyrus communis), cultivated in many varieties in temperate climates; also, the tree which bears this fruit. See Pear family, below.
Pear blight. (a)
(Bot.) A name of two distinct diseases of pear trees, both causing a destruction of the branches, viz., that caused by a minute insect (Xyleborus pyri), and that caused by the freezing of the sap in winter.
A. J. Downing. (b)
(Zol.) A very small beetle (Xyleborus pyri) whose larv bore in the twigs of pear trees and cause them to wither. --
(Bot.), a suborder of rosaceous plants (Pome), characterized by the calyx tube becoming fleshy in fruit, and, combined with the ovaries, forming a pome. It includes the apple, pear, quince, service berry, and hawthorn. --
(Physics), a kind of gauge for measuring the exhaustion of an air-pump receiver; -- so called because consisting in part of a pear-shaped glass vessel. --
(Zol.), any marine gastropod shell of the genus Pyrula, native of tropical seas; -- so called from the shape. --
(Zol.), the larva of a sawfly which is very injurious to the foliage of the pear tree.
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Wed 19th December 2018