Not having rings; not ringed; lacking the structure of rings.
From Latin ex- (without) + annulate (having rings, from annulus, 'ring'). A biological or zoological term describing organisms or structures without ring-like segments or markings.
The word 'annulus' (Latin for ring) lives on in words about rings and circular things—annulet, annular, annulate—and its opposite exannulate shows how the ex- prefix lets scientists precisely specify what something lacks, crucial for precise biological classification.
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