| cotyle | <anatomy> Any cup-shaped structure. Synonym: acetabulum. Origin: G. Kotyle, anything hollow, the cup or socket of a joint (05 Mar 2000) |
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| cotyledon | <botany> Modified leaf (seed leaf), found as part of the embryo in seeds, involved in either storage or absorption of food reserves. Dicotyledonous seeds contain two, monocotyledonous seeds only one. May appear above ground and show photosynthetic activity in the seedling. (18 Nov 1997) |
| cotyledonary placenta | <plant biology> A placenta in which the substance is divided into lobes or cotyledons. (05 Mar 2000) |