Definition from Wiktionary, the free dictionary
- Portuguese Man-of-War
- Portuguese man-o'-war, Portuguese man-o-war, Portuguese man o' war, Portuguese Man o' War, Portuguese Man-O-War, Portuguese Man-O'War, Portuguese Man-o'-War, Portuguese Man-o-War, Portuguese man o'war, Portuguese Man O' War (rare), Portuguese-man-o-war (rare, obsolete), Portuguese Man o'War (rare), Portuguese man-o'war (rare)
- Used other than as an idiom: see Portuguese, man-of-war.
- A floating colony of hydrozoans (Physalia physalis) attached to a float; it superficially resembles a jellyfish.