[ey-keen, uh-keen]
noun Botany.
any small, dry, hard, one-seeded, indehiscent fruit.
Also, akene.

1835–45; < Neo-Latin achaenium, equivalent to a- a-6 + Greek chain- (stem of chaínein to gape) + Latin -ium -ium

achenial [ey-kee-nee-uhl, uh-kee-] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
achene or akene (əˈkiːn)
a dry one-seeded indehiscent fruit with the seed distinct from the fruit wall. It may be smooth, as in the buttercup, or feathery, as in clematis
[C19: from New Latin achaenium that which does not yawn or open, from a-1 + Greek khainein to yawn]
akene or akene
[C19: from New Latin achaenium that which does not yawn or open, from a-1 + Greek khainein to yawn]
a'chenial or akene
a'kenial or akene

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
achene also akene   (ā-kēn')  Pronunciation Key 
A small, dry, one-seeded fruit in which the seed sits free inside the hollow fruit, attached only by the stem of the ovule. Achenes are indehiscent (they do not split open when ripe). The fruits of the sunflower and elm are achenes.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica


dry, one-seeded fruit lacking special seams that split to release the seed. The seed coat is attached to the thin, dry ovary wall (husk) by a short stalk, so that the seed is easily freed from the husk, as in buckwheat. The fruits of many plants in the buttercup family and the rose family are achenes.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The tubercle is about three-fourths to nearly as wide as the broadest part of
  the achene.
Needle spike-rush: egg-shaped, white to pale gray or yellowish achene.
The fatty acid composition of the achene oil determines its end use suitability.
For example, a water soluble inhibitor in the achene coat must be leached prior
  to germination.
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