Webster's English Dictionary

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cotyledon

cot.y.le.don or cot.y.le.don.ous \.ka:t-*l-'e-d-*n\ \-'e-d-n*l, -*n-*l\ 
   \-'e-d-*n-.er-e-\ \-'e-d-*n-*s\ n [NL, fr. Gk kotyle-do-n cup-shaped 
   hollow, fr. kotyle- cup] 1: a placental lobule  2: the first leaf or one of 
   the first pair or whorl of leaves developed by  the embryo of a seed plant 
   - cot.y.le.don.al aj