Bulb

Webster's Practical Dictionary- A Practical Dictionary of the Englih Language · 1884 · p. 59

bulb, n. {Bot.) A bud growing from a plant, (.usually below ground), and producing a stem above and roots below. {Anat.) A part shaped like bulbous roots. A protuberance on a stem, as the bulb of a thermometer, —v. i. To form bulbs.