A Scottish surname from Scottish Gaelic. / A hamlet in Lac Ste. Anne County, Alberta, Canada. / A suburb of Palmerston, Northern Territory, Australia.

plural of Marcus Gunn phenomenon

An autosomal-dominant synkinesis in which two or more muscles that are independently innervated have simultaneous or coordinated movements.

plural of Marcus Gunn pupil

A pupil of the eye that exhibits unusually little constriction when a bright light is swung from the unaffected eye to the affected eye. It can be caused by a lesion of the optic nerve.

plural of Gunn-Peterson trough

A feature in astronomical spectrometry of distant light, caused by the Reionization Era's absorption of UV light, leaving a gap in the spectrum.