pear

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of several trees of the genus Pyrus in the rose family, having glossy leaves and white flowers, especially P. communis, widely cultivated for its edible fruit.
• noun The fruit of any of these trees, having gritty, juicy flesh and usually a shape that is spherical at the base and tapering toward the stalk.

from The Century Dictionary.

• An obsolete form of peer.
• noun The fruit of the pear-tree.
• noun The tree Pyruts communis.
• noun A pear-shaped pearl, as for the pendant of an ear-ring. Evelyn, Mundus Muliebris

from the GNU version of the Collaborative International Dictionary of English.

• noun (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.
• noun (Bot.), (Zoöl.) A very small beetle (Xyleborus pyri) whose larvæ bore in the twigs of pear trees and cause them to wither.
• noun (Bot.) a suborder of rosaceous plants (Pomeæ), 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.
• noun (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.
• noun (Zoöl.) any marine gastropod shell of the genus Pyrula, native of tropical seas; -- so called from the shape.
• noun (Zoöl.) the larva of a sawfly which is very injurious to the foliage of the pear tree.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun An edible fruit produced by the pear tree, similar to an apple but elongated towards the stem.
• noun A type of fruit tree (Pyrus communis).
• noun The wood of the pear tree.
• noun choke pear (a torture device)

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun Old World tree having sweet gritty-textured juicy fruit; widely cultivated in many varieties
• noun sweet juicy gritty-textured fruit available in many varieties