noun, plural cypselae [sip-suh-lee] . Botany.
an achene with an adherent calyx, as in the composite plants.

1865–70; < Neo-Latin < Greek kypsélē hollow vessel, chest, box Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
cypsela (ˈsɪpsɪlə)
n , pl -lae
the dry one-seeded fruit of the daisy and related plants, which resembles an achene but is surrounded by a calyx sheath
[C19: from New Latin, from Greek kupselē chest, hollow vessel]

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American Heritage
Science Dictionary
cypsela   (sĭp'sə-lə)  Pronunciation Key 
Plural cypselae (sĭp'sə-lē')
A type of dry fruit consisting of an achene with a closely adhering calyx, the characteristic fruit of the aster family. Dandelions produce cypselae in which the plume, or pappus, is actually a modified sepal.
The American Heritage® Science Dictionary
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