subabdominal en · ADJ
Etymology
From sub- + abdominal.
Meanings
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(not-comparable) Beneath the abdomen.
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[…]
1839, John Timbs, The year-book of facts in science and art, page 187: