citrus Meaning, Definition & Usage

  1. noun any of numerous fruits of the genus Citrus having thick rind and juicy pulp; grown in warm regions
    citrus fruit; citrous fruit.
  2. noun any of numerous tropical usually thorny evergreen trees of the genus Citrus having leathery evergreen leaves and widely cultivated for their juicy edible fruits having leathery aromatic rinds
    citrus tree.

WordNet

Cit"rus noun
Etymology
L., a citron tree.
Definitions
  1. (Bot.) A genus of trees including the orange, lemon, citron, etc., originally natives of southern Asia.

Webster 1913