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cot·y·le·don

n 1  :  a lobule of a mammalian placenta  2  :  the first leaf or one of the first pair or whorl of leaves developed by the embryo of a seed plant or of some lower plants (as ferns) cot*y*le*don*ary adj 
 
 

 
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St. Mary's Clearwater Valley Hospital and Clinics (Cottonwood, Idaho - Idaho County)