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

mayor

bone marrow

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)

sea

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