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Yes, costae is a Scrabble word!
...and is worth 8 points in Scrabble, and 9 points in Words with Friends
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)
What Scrabble words can I make with the letters in costae?
5 Letter Words
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2 Letter Words