base of heart
base of heart n.
The part of the heart formed mainly by the left atrium and to a lesser extent by the posterior part of the right atrium, directed backward and to the right, and separated from the vertebral column by the esophagus and aorta.
- Base of skull
base of skull base of skull n. The interior aspect of the skull, on which the brain rests. The inferior or external aspect of the skull.
- Base of lung
base of lung base of lung n. The lower concave part of the lung that rests upon the convex part of the diaphragm.
- Base of stapes
base of stapes base of stapes n. The flat portion of the stirrup of the ear that fits in the oval window between the middle and inner ear. Also called footplate.
- Base on
the bottom support of anything; that on which a thing stands or rests: a metal base for the table. a fundamental principle or groundwork; foundation; basis: the base of needed reforms. the bottom layer or coating, as of makeup or paint. Architecture. the distinctively treated portion of a column or pier below the shaft or […]
- Base pair
any of the pairs of the hydrogen-bonded purine and pyrimidine bases that form the links between the sugar-phosphate backbones of nucleic acid molecules: the pairs are adenine and thymine in DNA, adenine and uracil in RNA, and guanine and cytosine in both DNA and RNA. base pair n. The pair of nitrogenous bases that connects […]