'Sucking fish' definitions:

Definition of 'sucking fish'

From: WordNet
noun
Marine fishes with a flattened elongated body and a sucking disk on the head for attaching to large fish or moving objects [syn: remora, suckerfish, sucking fish]

Definition of 'Sucking fish'

From: GCIDE
  • Sucking \Suck"ing\, a. Drawing milk from the mother or dam; hence, colloquially, young, inexperienced, as, a sucking infant; a sucking calf. [1913 Webster]
  • I suppose you are a young barrister, sucking lawyer, or that sort of thing. --Thackeray. [1913 Webster]
  • Sucking bottle, a feeding bottle. See under Bottle.
  • Sucking fish (Zool.), the remora. See Remora. --Baird.
  • Sucking pump, a suction pump. See under Suction.
  • Sucking stomach (Zool.), the muscular first stomach of certain insects and other invertebrates which suck liquid food. [1913 Webster]