noun, Physics.
the component of angular momentum of an electron in an atom or a nucleon in a nucleus, arising from its orbital motion rather than from its spin.


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  • Orbital cavity

    orbital cavity n. The bony cavity containing the eyeball and its associated muscles, vessels, and nerves. Also called eye socket, orbit.

  • Orbitale

    [awr-bi-tey-lee] /ˌɔr bɪˈteɪ li/ noun 1. Craniometry, Cephalometry. the lowermost point on the lower margin of the left orbit, located instrumentally on the skull or by palpation on the head. orbitale or·bi·ta·le (ôr’bĭ-tā’lē) n. The lowermost point in the lower margin of the bony orbit that may be felt under the skin.

  • Orbital gyrus

    orbital gyrus n. Any of the small, irregular convolutions on the concave inferior surface of each frontal lobe of the cerebrum.

  • Orbital-index

    noun, Craniometry. 1. the ratio of the maximum breadth to the maximum height of the orbital cavity multiplied by 100.

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