1. The ordinal number of forty-three in counting order
   - forty-third

See also: ordinal

• bipinnate
• bipinnate leaf
• bipinnatifid
• biplane
• biplane flying fish
• bipolar
• bipolar disorder
• bipolarity
• biprism
• biquadrate
• biquadratic
• biquadratic equation
• biquadratic polynomial
• biracial
• biradial
• biradially
• biramous
• birch
• birch beer
• birch family
• birch leaf miner
• birch oil
• birch rod
• Chinese cinnamon
• Chinese cork oak