Relating to or causing exhalation; serving to breathe out or expel air.
From Latin 'ex-' (out) + 'halare' (to breathe) + the suffix '-ant' indicating a quality or agent. A technical anatomical term.
In zoology, exhalant describes the opening in clams and bivalves where water flows OUT after passing through their gills—it's the opposite of the inhalant opening—elegant naming from nature's water filtration systems.
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