Having half the angles or sides of an octagon; partially eight-angled.
From 'demi-' (half) + 'octangular' (having eight angles, from Latin 'octo' + Latin 'angulus' meaning angle). A rare technical term combining geometric terminology with the productive 'demi-' prefix.
This word is so specialized that it barely exists in modern English—it represents the kind of hyper-precise technical vocabulary that 16th-17th century geometers needed before standardized mathematical symbols existed.
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