semiminor axis

[sem-ee-mahy-ner, sem-ahy-, sem-ee-, sem-ahy-]

sem·i·mi·nor ax·is

[sem-ee-mahy-ner, sem-ahy-, sem-ee-, sem-ahy-]
noun
1.
Geometry. one half the minor axis of an ellipse.
2.
Astronomy. one half the minor axis of the ellipse that one celestial body describes around another, as a planet around the sun.

Origin:
1925–30; semi- + minor
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Semiminor axis has a plethora of syllables.
So is cyclotrimethylenetrinitramine. Does it mean:
a white, crystalline, water-insoluble, powerful high explosive, C3H6N6O6, used chiefly in bombs and shells.
given to using long words.
WordNet
semiminor axis

noun
one-half the minor axis of an ellipse 
WordNet® 3.0, © 2006 by Princeton University.
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