Mîm was the last of the Petty-Dwarves. He sheltered Túrin during his outlaw days in his home in Amon Rûdh, since which was named Dar-en-Danwedh (The House of Ransom). He and his remaining son Ibun lived with Túrin and his band of outlaws for a year. In the year 487 of the First Age, Mîm was captured by a tribe of Orcs, to who he betrayed the location of Túrin and his home.

In the year 501, he resettled the halls of Nargothrond which his ancestors had built. Húrin, father of Túrin, later came along a slew the dwarf in revenge of his son. Mîm outlived both of his sons and the Petty-Dwarves died with him.

Mim.
An adjective meaning affecting a shy or modest manner. Usually applied to flirtatious females. Most of the dictionaries I've checked tag it as a dialect, but fail to say what geographical area this dialect is attached to. They do say that it originated in 1641. Some of the later editions of Webster claim that its etymology arises from imitating 'the act of pursing the lips'. It still makes an occasional appearance in modern literature.

mim- (also mimo-) is a prefix that arises from the word mime, meaning to mimic.