• (a.) Having only one cotyledon, seed lobe, or seminal leaf.
(= monocot) Plants in which the developing plant has only one cotyledon. Grasses are perhaps the commonest examples of the Class (which also contains palms, lilies and orchids).
Mon`o·cot`y·le'don·ous adjective [ Confer French monocotylédoné .] (Botany) Having only one cotyledon, seed lobe, or seminal leaf. Lindley. 
With a single cotyledon.
Monocotyledonous refers to plants with only one cotyledon.
[adj] - (of a flowering plant) having a single cotyledon in the seed as in grasses and lilies
adjective (of a flowering plant) having a single cotyledon in the seed as in grasses and lilies
belonging or pertaining to the monocotyledons.