Base
A compound that reacts with an acid to form a salt. It is another term for alkali.

Benign
Not malignant. A benign tumor is one which does not metastasize or invade tissue. Benign tumors may still be lethal, due to pressure on vital organs.

Biohazard
A combination of the words biological hazard. Organisms or products of organisms that present a risk to humans

Boiling point
The temperature at which the vapor pressure of a liquid equals atmospheric pressure.