ancus

Uncertain; possibly from angō (“to draw together, to strangle”). It could also be from Proto-Indo-European *h₂énkos (“curve”), but this is a neuter s-stem noun (like e.g. genus), a formation unknown to adjectives. If from Proto-Indo-European *h₂énkos (“curve”), it would possibly be cognate with Latin angulus (“angle”) and hence English angle.

• (Classical) IPA^(key): /ˈan.kus/, [ˈäŋkʊs̠]
• (modern Italianate Ecclesiastical) IPA^(key): /ˈan.kus/, [ˈäŋkus]

ancus (feminine anca, neuter ancum); first/second-declension adjective

1. (hapax, possibly) bent or bound
   • 1839 [8th century CE], Paulus Diaconus, edited by Karl Otfried Müller, Excerpta ex libris Pompeii Festi De significatione verborum, page 19:

     Ancus appellatur, qui aduncum brachium habet, et exporrigi non potest.

     That which has a crooked arm and cannot be extended is called ancus.

First/second-declension adjective.

• “ancus”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
• ancus in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition with additions by D. P. Carpenterius, Adelungius and others, edited by Léopold Favre, 1883–1887)
• ancus in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.