Definition of mentum in US English:

mentum

noun

Entomology
  • A part of the base of the labium in some insects.

    • ‘The cricomental space was determined using a thin ruler to connect the cricoid cartilage to the inner mentum, with the head in the neutral position.’

Origin

Early 19th century: from Latin, literally ‘chin’.

Pronunciation

mentum

/ˈmen(t)əm/