bulb

The bulb-shaped underground portion of a plant such as a tulip, consisting of a shortened stem and many fleshy scale leaves, from which the rest of the plant may be regrown.

the plants which grow in the earth from seed or bulbs.

Once it [a snowdrop variety] became established, some bulbs were lifted and passed on to be chipped (i.e. cut into small pieces and grown on).

The medulla oblongata.

Any solid object rounded at one end and tapering on the other, possibly attached to a larger object at the tapered end.

the bulb of the aorta

Any solid object rounded at one end and tapering on the other, possibly attached to a larger object at the tapered end.

an incandescent bulb

an LED bulb

A bulbous protuberance at the forefoot of certain vessels to reduce turbulence.

To take the shape of a bulb; to swell.