trefoil arch

1. 1.

   a pointed arch having cusps in the intrados on either side of the apex

   Broaderpointed arch

Questions about trefoil arch

What does trefoil arch mean?

trefoil arch means "a pointed arch having cusps in the intrados on either side of the apex".

Is trefoil arch a common word?

trefoil arch is banded "Rare" — specialist or archaic — most readers will not have met it. The band comes from how often the word appears in a large corpus of everyday English, not from an editor's impression.