costa

• 名词，指植物或动物身上类似肋的构造，如叶片的中脉、昆虫翅膀加厚的翅脉，或人类及大多数脊椎动物从脊柱伸出的12对弯曲骨头之一。

A noun referring to a riblike structure in plants or animals, such as a middle rib of a leaf, a thickened vein of an insect wing, or one of the 12 pairs of curved bones extending from the spine in humans and most vertebrates.

1. Rib (anatomy)C1formalscientific

   Any of the 12 pairs of curved bones extending from the spine to or toward the sternum in humans and similar bones in most vertebrates.

   肋骨（解剖学）

   • The patient fractured a costa in the accident.
   • The human skeleton includes 12 pairs of costae.
   • The doctor examined the costa for signs of damage.

   同义词rib

2. Rib-like structure (biology)C2formalscientific

   A riblike part of a plant or animal, such as the middle rib of a leaf or a thickened vein of an insect wing.

   肋状结构

   • The costa of the leaf provides structural support.
   • In entomology, the costa is a prominent vein in the insect wing.
   • The plant's costa is clearly visible under the microscope.

   同义词midribnerveribvein