different between triquetrous vs triquetral

English

From Latin triquetrus.

triquetrous (comparative more triquetrous, superlative most triquetrous)

Triangular; especially (in natural sciences), having a triangular cross-section.
- 1658, Sir Thomas Browne, The Garden of Cyrus, Folio Society 2007, p. 172:
  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

triquetral (not comparable)

triquetral (plural triquetrals)

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