citrus

[si-truhs]
noun, plural citruses.
1.
any small tree or spiny shrub of the genus Citrus, of the rue family, including the lemon, lime, orange, tangerine, grapefruit, citron, kumquat, and shaddock, widely cultivated for fruit or grown as an ornamental.
2.
the tart-to-sweet, pulpy fruit of any of these trees or shrubs, having a characteristically smooth, shiny, stippled skin.
adjective
3.
Also, citrous. of or pertaining to such trees or shrubs, or their fruit.

Origin:
1815–25; < Neo-Latin, Latin: citron tree

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
citrus (ˈsɪtrəs)
 
n , pl -ruses
1.  any tree or shrub of the tropical and subtropical rutaceous genus Citrus, which includes the orange, lemon, lime, grapefruit, citron, and calamondin
 
adj
2.  of, relating to, or belonging to the genus Citrus or to the fruits of plants of this genus
 
[C19: from Latin: citrus tree, sandarac tree; related to Greek kedros cedar]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

citrus
1825, from Mod.L. genus name, from L. citron, name of a tree with lemon-like fruit, the first citrus fruit available in the West. The name, like the tree, is probably of Asiatic origin. But Klein traces it to Gk. kedros "cedar," and writes that the change of dr into tr shows that the word came from Greek
into Latin through the medium of the Etruscans. Citric first recorded 1800.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
citrus   (sĭt'rəs)  Pronunciation Key 
  1. Any of various evergreen trees or shrubs bearing fruit with juicy flesh and a thick rind. Citrus trees are native to southern and southeast Asia but are grown in warm climates around the world. Many species have spines. The orange, lemon, lime, and grapefruit are citrus trees.

  2. The usually edible fruit of one of these trees or shrubs.


The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Oh yeah, stocking up on cheesecloth and light linen cloths to wrap up the
  citrus trees.
The mixing of citrus and cocoa is not an unfamiliar practice.
Then came the hours practicing artful citrus peels, and the insouciance
  concerning drinks of raw egg whites.
If he thought that citrus fruit would do him good, he would suck one lemon
  after another.
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