Definition: pyrus

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Source: WordNet (r) 1.7 

Pyrus
     n : fruit trees native to the Old World: pears [syn: Pyrus, genus
         Pyrus]

Source: Webster's Revised Unabridged Dictionary (1913) 

Pyrus \Py"rus\, n. [L. pyrus, or better pirus, pear tree.]
   (Bot.)
   A genus of rosaceous trees and shrubs having pomes for fruit.
   It includes the apple, crab apple, pear, chokeberry, sorb,
   and mountain ash.