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actinium a radioactive chemical element of the rare-earth group that has eighty-nine protons in each nucleus. (symbol: Ac)
antiquarian of, relating to, or dealing in rare old books. [1/3 definitions]
ball lightning a rare form of lightning manifested in the form of a glowing reddish ball, approximately six inches to a foot in diameter, that moves rapidly along the ground or in the air until it disintegrates.
bibliomania a craze for acquiring and owning books, esp. rare books.
bibliophile a lover or collector of books, esp. for the fine or rare physical qualities of their paper, printing, binding, or the like.
bibliopole a bookseller, esp. of rare books.
botanical garden a garden in which many species of plants, esp. exotic or rare specimens, are displayed for enjoyment and scientific study.
cerium a highly reactive chemical element of the rare-earth group that has fifty-eight protons in each nucleus and that occurs naturally only in compounds. (symbol: Ce)
collector's item an object that might have especial value or interest for a collector, usu. because it is rare or unusual.
delicacy something delightful or rare, esp. food. [1/8 definitions]
didymium a rare metal, once considered an element, consisting of the elements neodymium and praseodymium. [2 definitions]
dysprosium a rare-earth metal chemical element of the lanthanide series that has sixty-sixprotons in each nucleus. (symbol: Dy)
erbium a rare-earth metal chemical element of the lanthanide series that has sixty-eight protons in each nucleus. (symbol: Er)
europium a highly reactive chemical element of the rare-earth group that has sixty-three protons in each nucleus. (symbol: Eu)
exotic anything rare or of foreign origin. [1/3 definitions]
find something found, esp. something rare, valuable, or pleasing. [1/8 definitions]
gadolinium a metal chemical element of the rare-earth group that has sixty-four protons in each nucleus. (symbol: Gd)
holmium a chemical element of the rare-earth group that contains sixty-seven protons in each nucleus. (symbol: Ho)
lanthanide series a series of chemical elements having from fifty-seven to seventy-one protons in each nucleus; rare-earth elements.
lanthanum a chemical element of the rare-earth group that has fifty-seven protons in each nucleus and that occurs as a soft, highly reactive, solid metal or as a trivalent ion. (symbol: La)
lutetium a metal chemical element of the rare-earth group that has seventy-one protons in each nucleus. (symbol: Lu)