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Meaning of accessorius

ac•ces•so•ri•us

Pronunciation: (ak"su-sôr'ē-us, -sōr'-), [key]
— pl. -so•ri•i
  1. any muscle, nerve, gland, etc., that reinforces the action of another.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.