noun, plural retinacula [ret-n-ak-yuh-luh] .
Anatomy, Zoology. any of various small structures that hook, clasp, or bind other structures to move them or hold them in place.
Entomology. a bristle on the butterfly forewing that clasps to the frenulum of the hindwing.

1815–25; < Neo-Latin; Latin retināculum tether, rope which holds fast or restrains, equivalent to retin(ēre) to hold fast, retain + -ā- (from v. stems ending in -ā-; cf. gubernaculum) + -culum -cule2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
retinaculum (ˌrɛtɪˈnækjʊləm)
n , pl -la
1.  connection or retention or something that connects or retains
2.  zoology a small hook that joins the forewing and hind wing of a moth during flight
[C18 (a surgical instrument used in castration): Latin, from rētinēre to hold back]

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

retinaculum ret·i·nac·u·lum (rět'n-āk'yə-ləm)
n. pl. ret·i·nac·u·la (-lə)
A band or bandlike structure that holds an organ or a part in place.

ret'i·nac'u·lar (-lər) adj.
The American Heritage® Stedman's Medical Dictionary
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