■ noun
1》 a rounded underground storage organ present in lilies and some other plants, consisting of a short stem surrounded by fleshy leaf bases and lying dormant over winter.
2》 short for light ~ .
3》 an expanded or rounded part at the end of something.
4》 a hollow container from which air can be expelled by squeezing, used to fill a syringe, pipette, etc.
Origin
ME: via L. from Gk bolbos 'onion, ~ous root'.