A word for “snowy” or “snow-white”, an adjective form of lossë “snow” (PE17/161; VT42/18). In one place it was simply glossed “white” (PE17/71), though in most places the generic Quenya word for “white” is ninquë.
Conceptual Development: In some poems from written around 1930, Tolkien used similar words for “white” in a couple places, for example in the phrase ᴱQ. ondoli losse karkane “the white rocks snarling” from the Oilima Markirya poem (MC/213); here the word for “white” might be the plural of an adjective ᴱQ. lossa as suggested by Gilson, Welden and Hostetter (PE16/84). An element losse “white” also appears in the phrase ᴱQ. losselie telerinwa “the white people of the shores of Elfland” from the Nieninqe poem (MC/216). However, for this most part in the earliest period, losse was use for “flower” words; see that entry for discussion.
lossëa adj. "snow-white" (so in VT42:18; this would be an adjective derived from lossë "snow", but elsewhere, Tolkien implies that lossë itself can also be used as an adjective "snow-white"; see lossë #1 above)