Entom. [mod L.; see SUB- 1 f.] The basal part of the labium.

1

1877.  Huxley, Anat. Inv. Anim., vii. 403. The submentum is not directly articulated with the cranial skeleton.

2

1888.  Rolleston & Jackson, Anim. Life, 141. The labium … consists (1) of a large basal sub-mentum … (2) a mentum; (3) of two three-jointed palpi … (4) a ligula.

3