1. A root so called, like that of an onion or a crocus; a similar expansion, as that of a thermometer.

2. To project, or be protuberant.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• burb,
• builf,
• buly,
• biuld,
• bulam,
• balb,
• bulma,
• bumb,
• culb,
• bule,
• baulbs,
• bulg,
• bult,
• bul,
• buls,
• bilbe,
• builbs,
• bumby,
• buily,
• buell

• bulk,
• bull.

The adjective form of the word "bulb" is "bulbous".

The plural of the "bulb" can be the "bulbs".

The singular of the "bulb" can be the "bulb".