seed leaf Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. the primary or rudimentary leaf of the embryo of seed plants; cotyledon Example Sentence A seed leaf stores food for the seed. Synonyms cotyledon; rudimentary leaf; primary leaf Antonyms root Hear It! Say It! Write It! seed leaf Switch to cursive Start Share with your friends: