cos·ta /ˈkɑstə/
 肋骨,肋脈,葉的中肋
 cos·ta /ˈkɑstə/ 名詞
 (拉)肋,肋骨
 Cos·ta n.
 1. Anat. A rib of an animal or a human being.
 2. Bot. A rib or vein of a leaf, especially the midrib.
 3. Zool. (a) The anterior rib in the wing of an insect. (b) One of the riblike longitudinal ridges on the exterior of many corals.
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 costa
      n 1: a riblike part of a plant or animal (such as a middle rib of
           a leaf or a thickened vein of an insect wing)
      2: any of the 12 pairs of curved arches of bone extending from
         the spine to or toward the sternum in humans (and similar
         bones in most vertebrates) [syn: rib]
      [also: costae (pl)]