The name of a tree in Fangorn beloved of the Ent Bregalad (LotR/483). It is a compound of carnë (carni-) “red” and the adjective mírëa “jewelled”, converted to a noun with the abstract suffix -ië (PE17/83).
Quenya
carni-mírëa
red-jewelled
carnimírië
proper name. Red-jewelled
†carni-mírëa adj. "red-jewelled" (PE17:83), whence the name Carnimírië "[one] having red gems, Red-jewelled", the rowan-tree in Quickbeam's song (LotR2:III ch. 4, SA:caran, PE17:83), also translated "with adornment of red jewels" (Letters:224; where the reading "carnemírie" occurs)