A dream during which one is conscious that one is dreaming, and may be able to manipulate events.

plural of lucid dream

(emergency medicine) A temporary improvement in a patient's condition after a traumatic brain injury, after which the condition deteriorates.

plural of lucid interval

In a clear and easily understood way, in a lucid manner.

(organic chemistry) benzoyl peroxide

A layer of tissue in the eye of many vertebrate animals, immediately behind or sometimes within the retina, that reflects visible light so as to increase the light available to the photoreceptors.

plural of tapetum lucidum

An instrument that uses a shaped prism or mirrors to cause an apparent image of external objects to appear as if projected upon a plane surface, so that the outlines may be conveniently traced.

plural of camera lucida