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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