Particularly devilish; highly unpleasant or evil. / Intense.

Any water-based cyclone, usually much smaller than a tornado in magnitude.

Any very large ray, especially any species of the genus Manta or Cephaloptera. / Any large cephalopod. / The angler fish, Lophius piscatorius / Fishes of family Ceratiidae.

plural of sea devil

(archaic, UK) A swift.

The egg case of some sharks, skates, and chimaeras (Chondrichthyes).

plural of devil's purse

Conium maculatum, poison hemlock.

Synonym of Faustian bargain

(idiomatic) astounding good luck.