pinna

• 名词，指羽状复叶的第一级分裂（羽片），也指外耳可见的软骨部分（耳廓）。

A noun referring to a primary division of a pinnately compound leaf, or the visible cartilaginous part of the external ear.

1. Leaf partC1formal

   A primary division or leaflet of a compound leaf, especially one that is arranged in a pinnate pattern.

   小叶

   • The fern's frond is composed of many small pinnae.
   • Each pinna of the compound leaf is attached to the central rachis.
   • Botanists carefully examined the shape of each pinna.

   同义词leaflet

2. Ear structureB2formal

   The visible, cartilaginous outer part of the ear that collects sound waves.

   耳廓

   • The pinna helps funnel sound into the ear canal.
   • He had a small piercing on his left pinna.
   • The shape of the pinna varies among individuals.

   同义词auricle