From Middle English mere-, from Old English mere- (prefix), from Old English mere (“sea, ocean, lake, pond, pool, cistern”). More at mere.
- A prefix meaning "of or pertaining to the sea"; sea-; marine-.
- mercow, mermaid, merman, merswine, mersnake
Back-formation of merman, mermaid.
- (fantasy) Of, pertaining to, or associated with the realm of mermaids and mermen.
- merlady, merfolk, merwife, mermonster