from
The Collaborative International Dictionary of English v.0.48
cutlass fish \cutlass fish\, cutlassfish \cutlassfish\n.
1. (Zool.) a peculiar, long, thin, marine fish ({Trichiurus
lepturus}) of the southern United States and West Indies,
having a long whiplike scaleless body and sharp daggerlike
teeth; -- called also {frostfish}, {saber fish}, {silver
eel}, and, improperly, {swordfish}; also, several related
members of the genus {Trichiurus}. It is closely related
to snake mackerel.
Syn: frost fish, frostfish, hairtail.
[1913 Webster + WordNet 1.5]