cotyledon

n (botany 植) first leaf growing from a seed 子叶.

cot, cot-death, cotangent, cote, coterie, coterminous, cottage, cottage cheese, cottage hospital, cottage industry, cottage loaf, cottage pie, cottager, cotter-pin, cotton, cotton candy, cotton seed oil, cotton wool, cotton-wool, cottontail, couch, couch-grass, couchant, couchette, cougar, cough, could, coulter (US colter), council, council estate, council flat, council house, council house, council-chamber, councillor, councillor (US also councilor), councilor, counsel, counselling, counsellor, counsellor (US also counselor),