Main Entry: ba·cil·la·ry Pronunciation: 'bas-&-"ler-E, b&-'sil-&-rE Variant: alsoba·cil·lar/b&-'sil-&r, 'bas-&-l&r/ Function: adjective 1: shaped like a rod; also: consisting of small rods 2: of, relating to, or caused by bacilli <bacillary meningitis>