any of a group of closely related metallic elements, comprising the lanthanides, scandium, and yttrium, that are chemically similar by virtue of having the same number of valence electrons.
rare-earth element n.
[rair-ee] /ˈrɛər i/ noun 1. . 2. a carnival or street show; spectacle. /ˈrɛəriː/ noun 1. a street show or carnival 2. another name for peepshow “peep show contained in a box,” 1680s, so called “in imitation of the foreign way of pronouncing rare show” [Johnson]. “Johnson’s statement is prob. correct; the early exhibitors of […]
[rair-uh-fak-shuh n] /ˌrɛər əˈfæk ʃən/ noun 1. the act or process of . 2. the state of being . /ˌrɛərɪˈfækʃən/ noun 1. the act or process of making less dense or the state of being less dense n. c.1600, from Middle French raréfaction or directly from Medieval Latin rarefactionem (nominative rarefactio), noun of action from […]
[rair-uh-fahyd] /ˈrɛər əˌfaɪd/ adjective 1. extremely high or elevated; lofty; exalted: the rarefied atmosphere of a scholarly symposium. 2. of, belonging to, or appealing to an exclusive group; select; esoteric: rarefied tastes. [rair-uh-fahy] /ˈrɛər əˌfaɪ/ verb (used with object), rarefied, rarefying. 1. to make rare or rarer; make less dense: to rarefy a gas. 2. […]
[rair-uh-fahy] /ˈrɛər əˌfaɪ/ verb (used with object), rarefied, rarefying. 1. to make rare or rarer; make less dense: to rarefy a gas. 2. to make more refined, spiritual, or exalted. verb (used without object), rarefied, rarefying. 3. to become rare or less dense; become thinned: Moisture rarefies when heated. /ˈrɛərɪˌfaɪ/ verb -fies, -fying, -fied 1. […]