As an initialism mer
is (space|us|nasa).
As a noun mermaid is
a mythological creature with a woman's head and upper body, and a tail of a fish.
mermaid
Noun
(
en noun)
A mythological creature with a woman's head and upper body, and a tail of a fish.
Synonyms
* mergirl, merlady, mermaiden, merwoman
Hyponyms
* mermother
* merqueen
Hypernyms
* merperson
Holonyms
* merfolk
Related terms
* merman
* merewif
* merwolf
* mereswine
Coordinate terms
* melusine
* nixie
* siren
Derived terms
* mermaid's purse
* mermaid skirt