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Dictionary


sem'i•ma'jor ax'is



Pronunciation: (sem'ē-mā'jur, sem'ī-, sem"ē-, [key]sem"ī-),
1. Geom.one half the major axis of an ellipse.
2. Astron.one half the major axis of the ellipse that one celestial body describes around another, as a planet around the sun or a satellite around a planet, equivalent to the mean distance between the two bodies.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

semilunar valvesemimatte
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