Relating to or characterizing the characteristics of Actinomyces bacteria; an alternative or obsolete form related to Actinomycetes.
From Actinomyces + -tal (suffix variant). This appears to be a rare or variant form used in older scientific literature.
This word is so obscure that even most microbiologists would need to look it up—it's an artifact of how scientific terminology constantly evolves as better understanding emerges!
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