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.
- Orbital cavity
orbital cavity n. The bony cavity containing the eyeball and its associated muscles, vessels, and nerves. Also called eye socket, orbit.
[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.
noun, Craniometry. 1. the ratio of the maximum breadth to the maximum height of the orbital cavity multiplied by 100.