What is the meaning of Mer?

A repeat unit: a structural unit which through repetition forms a polymer.

merpeople

Alternative form of mayor and mair.

apple

apple tree

mere, simple

mare, female horse

sea (large body of water)

the ocean (the continuous body of salt water covering a majority of the Earth's surface)

to dare (to have the courage to do something)

to ladle, scoop (to get some liquid or grainy substance out of somewhere by turning in a bowl-shaped object and let it fill)

unstressed dative of ich.

sea

sky, heaven

apple tree

sea (large body of water)

dative of i: me, to me

spade (a garden tool with a handle and a flat blade for digging)

comparative degree of mye

more; used in forming the comparative form of long/foreign adjectives

sea (large body of water)

more

sea

soft; flabby, pliable, flexible

softly, supplely, pliably

unstressed form of mir

we, first person plural nominative pronoun.

dative of ich: me, to me

one, indefinite third person singular nominative pronoun.

mayor (in France and other countries, the chief executive of the municipal government of a city, borough, etc.)

mer, repeat unit

Comparative form of mycket, used in construction of comparative form of certain adjectives; more.

sea

Nasal mutation of ber (short).

Source: wiktionary.org