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bulb

n 1  :  a rounded dilation or expansion of something cylindrical <the of a thermometer>  : esp  :  a rounded or pear-shaped enlargement on a small base <the of an eyedropper>   2  :  a rounded part: as  a  :  a rounded enlargement of one end of a part - see BULB OF THE PENIS BULB OF THE VESTIBULE END BULB OLFACTORY BULB   b  :  MEDULLA OBLONGATAbroadly  :  the hindbrain exclusive of the cerebellum  c  :  a thick-walled muscular enlargement of the pharynx of certain nematode worms .
 
 

 
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