اثلج doesn't appear in Hans Wehr's Modern Standard Arabic dictionary, but Lane's Arabic-English Lexicon has an entry for it. Select the entry below for the full classical Arabic definition.

• اثلج Form 4

  4 اثلج أثلج اثلج ثلج It (a day, S, K, or a year, A) was, or became, snowy. (S, A, K.) -b2- He reached, came upon, or lighted on, snow; (K;) as also ثلج [written without any syll. signs, app. ]. (TA.) He entered upon [a t…

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