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Annular
AN'NULAR, a. [L. annulus, a ring, from Celtic ain, a circle, and ul, young, small; annulus, a little circle.]
Having the form of a ring; pertaining to a ring.
Annular crystal is when a hexahedral prism has six, or an octahedral prism eight marginal faces, disposed in a ring about each base; or when these prisms are truncated on all their terminal edges.
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