- cusp, leaflet - a thin triangular flap of a heart valve
--1 is a kind of flap
--1 is a part of heart valve, cardiac valve - leaflet - part of a compound leaf
--2 is a kind of leaf, leafage, foliage
--2 has particulars: pinna, pinnule- booklet, brochure, folder, leaflet, pamphlet - a small book usually having a paper cover
--3 is a kind of book
--3 has particulars: blue book; ticket book - booklet, brochure, folder, leaflet, pamphlet - a small book usually having a paper cover