1) Carpel 
one segment of a fruit (a schizocarp) that splits at maturity into units derived from the individual carpels, or a carpel, usually 1-seeded, released by the break-up at maturity of a fruit formed from 2 or more joined carpels.
a 1-seeded portion of an initially syncarpous fruit which splits apart at maturity, e.g. in the Apiaceae. Sometimes called a coccus, q.v.
• (n.) One carpel of an umbelliferous fruit. See Cremocarp.
One of a pair of seeds which split apart at maturity.
<plant biology> One segment of a fruit that breaks at maturity into units derived from the individual carpels. ... Compare: schizocarp. ... (09 Oct 1997) ... 
One of the segments of a schizocarp.
One-seeded portion of a fruit formed when it splits from the rest of the fruit
Mer'i·carp noun [ Greek 
One-seeded portion of a fruit formed when it splits from the rest of the fruit
The peculiar seed-like fruit of the Umbelliferae.
noun a carpel with one seed; one of a pair split apart at maturity