1. having three sharp edges or angles; triangular in cross-section
Usage: botanical; technical

Examples

• The triquetrous stem of the sedge plant has three distinct ridges.
• Botanists identified the species by its triquetrous leaves.
• The triquetrous cross-section made the plant stem easily recognizable.
• Many rush species have triquetrous stems that feel sharp to the touch.
• The triquetrous shape helps distinguish this grass from similar varieties.