spearfish has definitions from the field of zoology
1
[ noun ] (zoology) any of several large vigorous pelagic fishes resembling sailfishes but with first dorsal fin much reduced; worldwide but rare

Related terms

billfish Tetrapturus

2
[ noun ] (zoology) large long-jawed oceanic sport fishes; related to sailfishes and spearfishes; not completely cold-blooded i.e. able to warm their brains and eyes

Synonyms

marlin

*