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[ploo-toh-nee-uh n] /pluˈtoʊ ni ən/

Also, Plutonic
[ploo-ton-ik] /pluˈtɒn ɪk/ (Show IPA). of, relating to, or resembling Pluto or the lower world; infernal.
of or relating to Pluto (the god) or the underworld; infernal

1660s, “pertaining to the god Pluto,” from Latin Plutonius, from Greek Ploutonius, from Plouton “pertaining to Pluto” (see Pluto). Geological sense is from 1828 (see plutonic). Planetary sense by 1952.


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  • Plutonic

    [ploo-ton-ik] /pluˈtɒn ɪk/ adjective, Geology. 1. noting or pertaining to a class of igneous rocks that have solidified far below the earth’s surface. /pluːˈtɒnɪk/ adjective 1. (of igneous rocks) derived from magma that has cooled and solidified below the surface of the earth Also abyssal adj. “pertaining to or involving intense heat deep in the […]

  • Plutonic rock

    noun See intrusive rock

  • Plutonism

    [ploot-n-iz-uh m] /ˈplut nˌɪz əm/ noun, Geology. 1. the intrusion of magma and associated deep-seated processes within the earth’s crust. 2. (often initial capital letter) the disproven theory that all rocks formed by solidification of a molten mass, promulgated by Scottish geologist James Hutton (1726–97).

  • Plutonium

    [ploo-toh-nee-uh m] /pluˈtoʊ ni əm/ noun, Chemistry, Physics. 1. a transuranic element with a fissile isotope of mass number 239 (plutonium 239) that can be produced from non-fissile uranium 238, as in a breeder reactor. Symbol: Pu; atomic number: 94. /pluːˈtəʊnɪəm/ noun 1. a highly toxic metallic transuranic element. It occurs in trace amounts in […]

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