HYPOCOTYL Meaning of HYPOCOTYL in English [ ˌhʌɪpə(ʊ)'kɒtɪl ]■ noun Botany the part of the stem of an embryo plant between the stalks of the cotyledons and the root.OriginC19: from hypo- + cotyledon . Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004