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Latin word caleo comes from Proto-Indo-European *ḱelh₁-
*ḱelh₁- (Proto-Indo-European)
*kalēō (Proto-Italic)
caleo (Latin)
(figuratively) I am aroused, warmed or inflamed.. (figuratively) I am troubled or perplexed.. (figuratively) I am yet warm, new or fresh.. (figuratively, of a place) I am eagerly sought, I am frequented.. (figuratively, of abstract things) I am carried on warmly, I am urged on zealously.. I am warm or hot, glow.