An element in the names Gimilzôr and Imrazôr. Imrazôr is difficult to translate, but Gimilzôr is equated to two different Quenya names at different periods of Tolkien’s writing: Elros “Star-foam” in the unfinished “Notion Club Papers” story from 1946 (SD/380), and Telemnar in the list of Adûnaic kings in The Lord of the Rings (LotR/1035). The name Telemnar is unglossed, but a likely translation would be “Silver-fire”. Assuming the element zôr has the same meaning as its Quenya equivalents, could mean either “foam” or “fire”. There is a different Adûnaic word for foam: rôth or roth in Rothinzil* “Foam-flower”, so perhaps “fire” is a more useful interpretation, albeit quite speculative.
* zôrnoun. ?fire, ?foam