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 OBLONGATA : broadly : the hindbrain exclusive of the cerebellum c : a thick-walled muscular enlargement of the pharynx of certain nematode worms .
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