From rêver (“to dream”), from Middle French resver (“to wander, be lost in vague thoughts, guess inaccurately”), from Old French resver (“to consider, reflect, be delirious”), probably from Frankish *rēswan, *rāswan (“to consider, conjecture, guess”), from Proto-Germanic *rēswaną (“to think, reckon, calculate”), from Proto-Indo-European *rei- (“to reason, count”). Cognate with Old English rǣswan (“to think, consider, suspect, conjecture”). Related to Gothic [script?] (raþjō, “account, number, explanation”), Old High German rīm (“number”). More at rhyme.
rêve m (plural rêves)