accessorius

ac·ces·so·ri·us

[ak-suh-sawr-ee-uhs, -sohr-]
noun, plural ac·ces·so·ri·i [ak-suh-sawr-ee-ahy, -sohr-] .
Anatomy. any muscle, nerve, gland, etc., that reinforces the action of another.

Origin:
< Neo-Latin, Medieval Latin: accessory

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World English Dictionary
accessorius (ˌæksɛsˈɔːrɪəs) [Click for IPA pronunciation guide]
 
n
anatomy a muscle or nerve that has an augmenting action

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Accessorius is always a great word to know.
So is optic nerve. Does it mean:
a network of cells and cell-forming tissue that protects the body from pathogens, destroys infected, malignant cells, and removes cellular debris
either one of the second pair of cranial nerves, consisting of sensory fibers that conduct impulses from the retina to the brain
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