Definition of black dolphin in English:

black dolphin

noun

  • 1rare (More fully "black dolphin fly") a black aphid, a blackfly; specifically the bean aphid, Aphis fabae; (now rare).

  • 2Any of several marine dolphins (family Delphinidae) with black skin; especially the long-finned pilot whale, Globicephala melas, and the Chilean dolphin, Cephalorhynchus eutropia.

Origin

Mid 18th century; earliest use found in William Ellis (c1700–1758), agriculturist and writer.