perigonal

An obsolete adjective meaning surrounding or circumambient; rarely used in modern English.

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1. Relating to a perigone C2 formal

   Of or relating to a perigone, which is the envelope of lines or curves that form a geometric figure, or in botany, the floral envelope.

   • The perigonal structures of the flower were studied under a microscope.
   • In geometry, the perigonal lines define the boundary of the shape.
   • The botanist noted the perigonal characteristics of the plant species.

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