Medical Dictionary


noun \ˈbəlb\

Medical Definition of BULB

:  a rounded dilation or expansion of something cylindrical <the bulb of a thermometer>; especially :  a rounded or pear-shaped enlargement on a small base <the bulb of an eyedropper>
:  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, hair 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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