noun, plural retia [ree-shee-uh, -shuh, -tee-uh] .
a pierced plate on an astrolabe, having projections whose points correspond to the fixed stars.
a network, as of fibers, nerves, or blood vessels.

1350–1400; Middle English riet < Latin rēte net

retial [ree-shee-uhl] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
rete (ˈriːtɪ)
n , pl retia
anatomy any network of nerves or blood vessels; plexus
[C14 (referring to a metal network used with an astrolabe): from Latin rēte net]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Medical Dictionary

rete re·te (rē'tē)
n. pl. re·ti·a (rē'tē-ə, rē'shə)
An anatomical mesh, network, or structure, as of veins, arteries, or nerves.

re'ti·al (-tē-əl, -shəl) adj.
The American Heritage® Stedman's Medical Dictionary
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