Relating to or characterizing members of the order Actinomycetales or the group of actinomycete bacteria.
From Actinomycete + -al (adjective suffix). Describes properties of these ray-forming bacteria.
Actinomycetal bacteria are responsible for the 'petrichor' smell of soil after rain—that earthy, wonderful smell comes from chemicals released by these branching bacteria, which is why soil smells like life itself!
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