caryopsis

[kar-ee-op-sis]
noun, plural caryopses [kar-ee-op-seez] , caryopsides [kar-ee-op-si-deez] . Botany.
a small, one-celled, one-seeded, dry indehiscent fruit with the pericarp adherent to the seed coat, the typical fruit of grasses and grains.

Origin:
1820–30; cary(o)- + -opsis

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Collins
World English Dictionary
caryopsis (ˌkærɪˈɒpsɪs)
 
n , pl -ses, -sides
a dry seedlike fruit having the pericarp fused to the seed coat of the single seed: produced by the grasses
 
[C19: New Latin; see karyo-, -opsis]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
caryopsis   (kār'ē-ŏp'sĭs)  Pronunciation Key 
Plural caryopses (kār'ē-ŏp'sēz') or caryopsides (kār'ē-ŏp'sĭ-dēz')
A small, dry, one-seeded fruit of a cereal grass, having the fruit and the seed walls united. Also called grain.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

caryopsis

specialized type of dry, one-seeded fruit (achene) characteristic of grasses, in which the ovary wall is united with the seed coat, making it difficult to separate the two except by special milling processes. All the cereal grains except buckwheat have caryopses.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Such caryopsis formation has never been observed previously in any known wheat.
Each spikelet consists of a caryopsis, the brown rice grain, and the
  surrounding hull.
Sometimes the germs are dislocated to the back of caryopsis for the caryopses
  formed from lodicules.
The ventral side of lodicule caryopsis is turned outwards of the flower.
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