either of a pair of nerves, the largest in the body, that originate in the sacral plexus of the lower back and extend down the buttocks to the back of the knees, where they divide into other nerves: the sciatic nerve and its branches innervate large areas of the pelvis, leg, and foot.
sciatic nerve n.
A nerve that arises from the sacral plexus and passes through the greater sciatic foramen to about the middle of the thigh where it divides into the common peroneal and tibial nerves.
A thick nerve that arises in the lower part of the spine and passes through the pelvis on its way to the back of the leg. It carries sensory information from the leg to the central nervous system and controls the action of many muscles. The sciatic nerve is the largest nerve in the body.
- Sciatic spine
sciatic spine n. A pointed process from the posterior border of the ischium on a level with the lower border of the acetabulum. Also called ischiadic spine.
Pathology. 1. severe combined immune deficiency. abbreviation 1. severe combined immune deficiency; a serious condition in which babies are born with reduced numbers of T- and B-lymphocytes, which impairs their immune systems and makes them susceptible to severe infections and cancer SCID abbr. severe combined immunodeficiency SCID 1. severe combined immunodeficiency 2. spacecraft identification
noun 1. a form of fiction that draws imaginatively on scientific knowledge and speculation in its plot, setting, theme, etc. science fiction noun 1. a literary genre that makes imaginative use of scientific knowledge or conjecture (as modifier): a science fiction writer science fiction definition Works of fiction that use scientific discoveries or advanced technology […]
- Science museum
noun 1. a museum in London, originating from 1852 and given its present name and site in 1899: contains collections relating to the history of science, technology, and industry