noun, plural perithelia [per-uh-thee-lee-uh] . Anatomy.
the connective tissue surrounding certain small vessels, as capillaries.

1875–80; < Neo-Latin, equivalent to Greek peri- peri- + thēl() nipple + Latin -ium -ium

perithelial, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

perithelium per·i·the·li·um (pěr'ə-thē'lē-əm)
n. pl. per·i·the·li·a (-lē-ə)
The connective tissue surrounding small blood vessels and capillaries.

The American Heritage® Stedman's Medical Dictionary
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