(organic chemistry) Initialism of polyacrylic acid.

The time of day when the sun appears above the eastern horizon. / The change in color of the sky at dawn. / (figuratively) Any great awakening.

(intransitive) To become less absorbent, reflective or fluorescent upon exposure to light.

(neurology, pathology) A progressive condition with a combination of severe epilepsy and cerebral palsy. It is characterised by severe physical and mental retardation and partial seizures.