Lewis & Short

numella, ae, f., a kind of shackle or fetter, for crimmals, slaves, and cattle: numella genus vinculi, quo quadrupedes deligantur, solet autem ea fieri nervo, aut corio crudo bovis, ut plurimum, Paul. ex Fest. p. 173 Müll.; less trust worthy is the explanation of Nonius: numellae machinae genus ligneum ad discruciandos noxios paratum, quo et collum et pedes immittunt. Plautus Asinaria (3, 2, 5): nervos, catenas, carcerem, numellas, pedicas, boias, Non. 144, 25 sq.; Col. 7, 8, 6: ubi potest etiam numella fabricari, ut, etc., id. 6, 19, 2 (al. numelli; al. numellae).