Base of tongue: The back third of the tongue. In contrast to the anterior tongue, which is the front two-thirds of the tongue. The distinction between the anterior and base of the tongue reflects the fact that they are of different embryological origin. The distinction also matters as regards cancer. See: Tongue cancer.
- Base pair
Base pair: Two DNA bases that are complementary to one another (A and T, or G and C) and join in strands to form the double-helix that is characteristic of DNA.
- Base sequence
Base sequence: The particular order of nucleotide bases in a DNA molecule.
- Base sequence analysis
Base sequence analysis: A method for determining the order of nucleotide bases in DNA.
- Base, pressor
Base, pressor: A pressor base is a substance chemically classified as a base (or amine) that is capable of raising the blood pressure. “Pressor” refers to causing a rise in blood pressure. The word comes from the French verb “presser” meaning “to exert pressure” or “to squeeze.”
Baseline: Information or data gathered at the beginning of a period from which variations that subsequently develop are compared.