Originally: a case charged with gunpowder designed to explode under water after a given interval so as to destroy any vessel in its immediate…

More fully Whitehead torpedo. A kind of self-propelled torpedo, shaped somewhat like a fish, with vertical and lateral fins, and powered by…

a torpedo resembling a fish in shape and with an automatic swimming action.

A torpedo.

Nautical slang. (In full tin fish.) A torpedo; also, a submarine.

= torpedo, n. 2. Also: = torpedo juice n. at torpedo, n. compounds 2.

U.S. Military slang. A torpedo; an aerial torpedo, or other similarly shaped missile.

Nautical slang. A torpedo. Cf. fish, n.1 1f.