- mentum - a projection like a chin formed by the sepals and base of the column in some orchids
--1 is a kind of plant part, plant structure
--1 is a part of orchid, orchidaceous plant- chin, mentum - the protruding part of the lower jaw
--2 is a kind of feature, lineament
--2 is a part of face, human face
--2 has parts: goatee
--2 has particulars: double chin, buccula- mentum - a projection below the mouth of certain mollusks that resembles a chin
--3 is a kind of body part
--3 is a part of insect; orchid, orchidaceous plant - chin, mentum - the protruding part of the lower jaw