n. pl. ret·i·nac·u·la (-lə)
A band or bandlike structure that holds an organ or a part in place.
[Latin retināculum, band, tether : retinēre, to restrain; see RETAIN + -culum, suff. denoting instruments.]
ret′i·nacu·lar (-lər) adj.
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Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.