a relation between any two entities such that if they had not been in this relation to each other, the nature of each would not necessarily have been different.
- External respiration
external respiration n. The exchange of respiratory gases in the lungs.
- External spermatic artery
external spermatic artery n. See cremasteric artery.
- External sphincter muscle of anus
external sphincter muscle of anus n. A fusiform ring of striated muscular fibers surrounding the anus, attached posteriorly to the coccyx and anteriorly to the central tendon of the perineum.
noun, Computers. 1. . noun, Computers. 1. storage, as on disk or tape, supplemental to and slower than main storage, not under the direct control of the CPU and generally contained outside it: Secondary storage for this system is contained on videodisk.