'Pear blight' definitions:

Definition of 'pear blight'

noun

A disease blackening the leaves of pear and apple trees [syn: fire blight, pear blight]

From: GCIDE

Pear \Pear\ (p[^a]r), 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. [1913 Webster]
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) (Zool.) A very small beetle (Xyleborus pyri) whose larv[ae] bore in the twigs of pear trees and cause them to wither.
Pear family (Bot.), a suborder of rosaceous plants (Pome[ae]), 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.
Pear gauge (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.
Pear shell (Zool.), any marine gastropod shell of the genus Pyrula, native of tropical seas; -- so called from the shape.
Pear slug (Zool.), the larva of a sawfly which is very injurious to the foliage of the pear tree. [1913 Webster] [1913 Webster]