Green’s Dictionary of Slang

batner n.

an ox.

1674		Head Canting Academy (2nd edn) 170: Batner An Oxe.
c.1698		B.E. Dict. Canting Crew.
1750–1882		B.M. Carew Life and Adventures.
1785, 1788, 1796		Grose Classical Dict. of the Vulgar Tongue n.p.: Battner. An ox: beef being apt to batten or fatten those that eat it. The cove has hushed the battner; i.e. has killed the ox.
1811		Lex. Balatronicum.
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.
1835		G. Kent Modern Flash Dict. 5: Battner, an ox.
1848		Flash Dict. in Sinks of London Laid Open.
c.1850		Duncombe New and Improved Flash Dict.