| 单词 | costa | 
| 释义 | cos·ta    (kŏstə)n. pl.   cos·tae (-tē)   Biology  A rib or a riblike part, such as the midrib of a leaf or a thickened anterior vein or margin of an insect's wing. [Latin; see  kost- in the Appendix of Indo-European roots.] costal adj.  | 
	
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