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sub- +‎ abdominal


subabdominal (not comparable)

  1. (anatomy) Beneath the abdomen.
    • 1839, John Timbs, The year-book of facts in science and art (page 187)
      The larva has now two serratures, or spines, on the cephalothorax; the legs are the same as in the second stage, but the subabdominal fins are more developed, and the tail has acquired two leaflets on each side []