Relating to or resembling a bacillus; rod-like in form; characteristic of or caused by bacilli.
From bacillus plus -ile (Latin suffix meaning capable of, tending to, or relating to). This is a variant form of bacillar, using a different Latin suffix for the same meaning.
Bacile is one of those words that hung on in technical scientific writing even as bacillar became standard, showing how Latin suffixes (-ile vs -ar) could both do the same job—linguists call this 'competing morphemes' and it's why scientific terminology sometimes feels redundant.
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