From sea + lion.
sea lion (plural sea lions)
- A marine mammal of any of several genera in the family Otariidae.
1922, Ben Travers, chapter 6, in A Cuckoo in the Nest:
- But Sophia's mother was not the woman to brook defiance. After a few moments' vain remonstrance her husband complied. His manner and appearance were suggestive of a satiated sea-lion.
member of the Otariidae family