Meaning of the word "Portuguese man-of-war" in English

What does "Portuguese man-of-war" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

Portuguese man-of-war

US /ˌpɔːrtʃʊˌɡiːz ˌmæn əv ˈwɔːr/
UK /ˌpɔːtʃəˈɡiːz mæn əv wɔːr/
"Portuguese man-of-war" picture

Noun

a marine cnidarian of the family Physaliidae, characterized by a gas-filled float and long, venomous tentacles, often mistaken for a jellyfish

Example:
Be careful when swimming in tropical waters; you might encounter a Portuguese man-of-war.
The beach was closed due to numerous sightings of the Portuguese man-of-war.