Augoeides

Augoeides is an obscure term meaning "luminous body" and thought to refer to the planets. Aleister Crowley considered the term to refer to the Holy Guardian Angel of Abramelin; the Atman of Hinduism the Daemon of the ancient Greeks. Robert Lomas associates the term with the Higher Self or soul of the individual

It appears that Porphyry used it and Thomas Taylor commented on it. The term is encountered in the literature of Neo-Platonic theurgy and was popularized in the 19th and 20th centuries by the Theosophists, Freemasons, and the Hermetic Order of the Golden Dawn.

To quote Thomas Taylor's comment on Porphyry:

We are afterwards sent through ample Elysium, and a few of us possess the joyful plains: till a long period, when the revolving orb of time has perfected its circulation, frees the soul from its concrete stains, and leaves the etherial sense pure, together with the fire (or splendour) of simple ether." For here he evidently conjoins the rational soul, or the etherial sense, with its splendid vehicle, or the fire of simple ether; since it is well known that this vehicle, according to Plato, is rendered by proper purgation 'augoeides', or luciform, and divine. It must here however be observed that souls in these meadows of asphodel, or summit of Pluto's empire, are in a falling state; or in other words through the secret influx of matter begin to desire a terrene situation. And this explains the reason why Hercules in the infernal regions is represented by Homer boasting of his terrene exploits and glorying in his pristine valour; why Achilles laments his situation in these abodes; and souls in general are engaged in pursuits similar to their employment on the earth: for all this is the natural consequence of a propensity to a mortal nature, and a desertion of the regions every way lucid and divine. Let the reader too observe, that, according to the arcana of the Platonic doctrine, the first and truest seat of the soul is in the intelligible world, where she lives entirely divested of body, and enjoys the ultimate felicity of her nature. And this is what Homer divinely insinuates when he says: "after this I saw the Herculean power, or image: but Hercules himself is with the immortal gods, delighting in celestial banquets, and enjoying the beautiful-footed Hebe." Since for the soul to dwell with the gods, entirely separated from its vehicle, is to abide in the intelligible world, and to exercise, as Plotinus expresses it, the more sacred contests of wisdom.

...
Wikipedia