batman(n = noun.person) - an orderly assigned to serve a British military officer;
is a kind of attendant, attender, tender
A weight used in the East, varying according to the locality; in Turkey, the greater batman is about 157 pounds, the lesser only a fourth of this; at Aleppo and Smyrna, the batman is 17 pounds. Simmonds. [1913 Webster]
A man who has charge of a bathorse and his load. Macaulay. [1913 Webster]
batman, n. (pl. -men) Mil. an attendant serving an officer.
Etymology:
OF bat, bast f. med.L bastum pack-saddle + MAN
N provision, supply, grist, grist for the mill, subvention, resources, groceries, grocery, providing, purveyance, reinforcement, reenforcement, commissariat, provender, ensilage, viaticum, caterer, purveyor, commissary, quartermaster, manciple, feeder, batman, victualer, grocer, comprador, restaurateur, jackal, pelican, sutler, grocery shop, grocery store.