A knoblike protuberance arising from a surface,as the prominence near the hinge of a bivalve shell or the projection at the scale tip of a seed-bearing cone.

• 圆形隆起，在一个表面突起的圆形装饰物似的隆起，如在双壳贝类贝壳边缘附近的突起或在含种子的球果顶端的突起。