triangular fold

tri·an·gu·lar fold

an inconstant fold of mucous membrane anterior to the palatine tonsil arising from the palatoglossal arch.
Synonym(s): plica triangularis [TA]
References in periodicals archive ?
Allow them to experiment with the triangular fold described in the article.
3 As one person holds the flag by the blue field, another makes a triangular fold in the opposite and continues to make triangular folds until the entire flag is in a triangle.