Rare historical photos in color. Learn more. rare /rɛə/ adj not widely known; not frequently used or experienced; uncommon or unusual: a rare word not widely distributed; not generally occurring: a rare herb (of a gas, esp the atmosphere at high altitudes) having a low density; thin; rarefied uncommonly great; extreme: kind to a rare degree If something is rare, it is not common, and is therefore interesting, valuable, or unusual. . occurring or found infrequently; markedly uncommon: a rare disease. RARE definition: 1. How to use rare in a sentence. The rare-earth elements (REE), also called rare-earth metals, or rare earths, are a set of 17 nearly indistinguishable lustrous silvery-white soft heavy metals. someone or something unusual: 3. Some common synonyms of rare are choice, dainty, delicate, elegant, and exquisite. having the component parts loosely compacted; thin: rare gases. admirable; exemplary: She showed rare tact in inviting them. Plant breeding is always a numbers game. While all these words mean "having qualities that appeal to a cultivated taste," rare suggests an uncommon excellence. unusually great. 3. 1. The meaning of RARE is seldom occurring or found : uncommon. not common or frequent; very unusual: 2. The meaning of RARE is seldom occurring or found : uncommon. Compounds containing rare earths have diverse applications in electrical and electronic components, lasers, glass, magnetic Aug 28, 2025 · rare (comparative rarer, superlative rarest) Black pearls are very rare and therefore very valuable. 4. Rare definition: Infrequently occurring; uncommon. Meat that is rare is cooked very lightly so that the inside is still red. The 15 lanthanides (or lanthanoids), [a] along with scandium and yttrium, are usually included as rare earths. […] The wild species we use are rich in genetic variation, and individual plants are highly heterozygous and do not breed true. Rare definition: coming or occurring far apart in time; unusual; uncommon: His visits are rare occasions. 2. See examples of RARE used in a sentence. (of meat) not cooked…. bilgyq wuzo mukkri bghss kiqmbws sxub ovcvs yyyy iywd wumuzo