1 (also light bulb) the glass part of an electric lamp that gives out light 灯泡:
The bulb's gone (= it no longer works) in this lamp.这灯的灯泡坏了。☞picture at light 见 light 插图
2 the round root of certain plants (植物的)鳞茎,球茎,球根:
a tulip bulb郁金香的鳞茎☞pictures at flower and on page C2 见flower及C2页插图