Christopher Tolkien mentions this as a noun meaning “star” from early and unpublished materials related to “The Notion Club Papers” stories (PM/372). It may be an element in the early Adûnaic name Indilzar for Elros. As Indilzar was replaced by Gimilzôr, it is likely that azar was replaced by gimli and gimil, which are well attested in later writings.
néadverb. ago, behind (earlier time), yes (it was so)
an-prefix. intensitive prefix, intensive, intensive prefix, plu-, plus, intensive, superlative, intensive
-usuffix. dual ending