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Italian word caldo comes from Latin caleo
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.
calidus (Latin)
(rare) having a white spot on the forehead. Fiery, fierce, vehement. Rash, eager, inconsiderate. Spirited, impassioned. Warm, hot.
caldo (Italian)
Fervour, ardour. Heat Warm, hot.