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From The Collaborative International Dictionary of English v.0.48:
Citrus \Cit"rus\ (s[i^]t"r[u^]s), n. [L., a citron tree.] 1. (Bot.) A genus of trees including the orange, lemon, lime, tangerine, citron, grapefruit, etc., originally natives of southern Asia. [1913 Webster] 2. (Bot.) any tree belonging to the genus Citrus, having leathery evergreen leaves and bearing a soft pulpy fruit covered by a thick skin; -- called also citrus tree. [PJC] 3. (Bot.) the fruit of a tree belonging to the genus Citrus, having a thick shiny skin and a soft, sweet to tart pulp. [PJC]