[per-uh-noor-ee-uhm, -nyoor-]
noun, plural perineuria [per-uh-noor-ee-uh, -nyoor-] . Anatomy.
the sheath of connective tissue that encloses a bundle of nerve fibers.

1835–45; < Neo-Latin; see peri-, neur-, -ium

perineurical, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
perineurium (ˌpɛrɪˈnjʊərɪəm)
the connective tissue forming a sheath around a single bundle of nerve fibres
[C19: from New Latin, from peri- + Greek neuron nerve]

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

perineurium per·i·neu·ri·um (pěr'ə-nur'ē-əm, -nyur'-)
n. pl. per·i·neu·ri·a (-nur'ē-ə, -nyur'-)
The sheath of connective tissue enclosing a bundle of nerve fibers.

per'i·neu'ri·al adj.
The American Heritage® Stedman's Medical Dictionary
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