The reflex which causes a bent knee to kick when the tendon below the patella (kneecap) is tapped.

plural of reflexive pronoun

(physics) The ratio of the flux reflected to that incident on a surface.

plural of reflectance

A telescope which produces a magnified image by reflecting light through a series of mirrors housed in a tube, using a large curved mirror to gather the light and one or more additional mirrors to transmit the light to an eyepiece.

The reflux of gastric juices into the esophagus. / (pathology) Ellipsis of gastroesophageal reflux disease.: chronic symptoms or mucosal damage produced by the abnormal reflux in the esophagus.

(medicine) A tool used by physician to hit the body and test for certain reflexes.

(astronomy) A nebula that consists of dust which reflects starlight and appears blue in photographs.

A possessive pronoun that is reflexive; i.e. one that refers back to the subject

(transitive) To cause to float again.