Meaning of the word sea-cow in English

What does sea-cow mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

sea-cow

US /ˈsiː ˌkaʊ/
UK /ˈsiː ˌkaʊ/

Noun

a very large ocean mammal that no longer exists:

Example:
A rare fossil of a sea cow was found in Aliso.