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/tɹaɪˈkwɛtɹəs/ · adjective
Triangular; especially (in natural sciences), having a triangular cross-section..
the lithostrata or figured pavements of the ancients […] consisted not all of square stones, but were divided into triquetrous segments, honey-combs, and sexangular figures, according to Vitruvius
Use triquetrous when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Triquetrous means Triangular; especially (in natural sciences), having a triangular cross-section..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
the lithostrata or figured pavements of the ancients […] consisted not all of square stones, but were divided into triquetrous segments, honey-combs, and sexangular figures, according to Vitruvius
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