Lewis Short
prōtēlum (noun N) :
* A row of oxen, etc., harnessed together for draught, a team: protelo trini boves unum aratrum ducent, Cato ap. Non. 363, 10; Lucil. ib. 363, 7 and 8: boum,Plin. 9, 15, 17, § 45: bina ternaque,id. 18, 18, 48, § 173; cf.: protelum, ἔξαμπρον, Gloss. Philox.
* Transf., a line, row, succession (ante-class. and poet.): protelo plagarum continuato,Lucr. 2, 531; 4, 190.
Charlton T. Lewis, Charles Short, A Latin Dictionary