Thin; porous; not dense; of slight consistence; rarefied; having relatively little matter in a given volume: as, a rare substance; the rare atmosphere of high mountains.Thinly scattered; coming or occurring at wide intervals; sparse; dispersed.Very uncommon or infrequent; seldom occurring or to be found; hardly ever met with.Hence Remarkable from uncommonness; especially, uncommonly good, excellent, valuable, fine, or the like; of an excellence seldom met with.Synonyms Rare, Scarce, infrequent, unusual. Rare implies that only few of the kind exist: as, perfect diamonds are rare. Scarce properly implies a previous or usual condition of greater abundance. Rare, means that there are much fewer of a kind to be found than may be found where scarce would apply.Singular, extraordinary, incomparable, choice.Not thoroughly cooked; partly cooked; underdone: applied to meat: as, rare beef; a rare chop.Early.A dialectal form of rear.An obsolete form of roar.