Lewis & Short

ăquālĭcŭlus, i, m. dim. [aqualis]; lit., a small vessel for water; hence,

  1. I. The stomach, maw, Sen. Ep. 90; Veg. Vet. 1, 40.
  2. II. The belly, paunch: pinguis aqualiculus, Pers. 1, 57.