1. The protruding part of the lower jaw
   "He stroked his mentum thoughtfully";
   - chin
    
2. A projection below the mouth of certain mollusks that resembles a chin
   "The snail's mentum helps in food manipulation"
    
3. A projection like a chin formed by the sepals and base of the column in some orchids
   "The orchid's mentum was particularly pronounced"

Derived forms: mentums

Type of: body part, feature, lineament, plant part, plant structure

Part of: face, human face, insect, orchid, orchidaceous plant

Encyclopedia: Mentum