(neuroanatomy) The nucleus of the thalamus which receives input from the optic tract.

(astronomy) A compact region at the center of a galaxy that has a much higher than normal luminosity over at least some portion, and possibly all, of the electromagnetic spectrum.

The accessory parasympathetic cranial nerve nucleus of the oculomotor nerve (cranial nerve III), supplying the constricting muscles of the iris and the ciliary muscle.

(astronomy) The remnant hot luminous core of the stellar progenitor of the planetary nebula, which ionizes the surrounding planetary nebula.

plural of nucleus

Resembling or characteristic of a nucleus.

plural of geniculate nucleus