Wiktionary
n. (context physics English) The superpartner of the photon.
Wikipedia
A photino is a hypothetical subatomic particle, the fermion WIMP superpartner of the photon predicted by supersymmetry. It is an example of a gaugino. Even though no photino has ever been observed so far, it is expected to be the lightest stable particle in the universe. It is proposed that photinos are produced by sources of ultra-high-energy cosmic rays.
Usage examples of "photino".
Photino creatures like birds - Photino birds - had fluttered out through the baryon stars as if they did not exist, colonizing shadow world after shadow world.
Paul imagined the horror of the photino civilization as the irrelevant froth of baryons through which they moved turned into a source of deadly danger, perhaps threatening the ultimate survival of their civilization.
Each sip of energy, by each of the photino birds, had lowered the temperature of the core, minutely.
But the conflict with the photino birds was so fundamental that communication was meaningless.
Paul imagined Xeelee nightfighters descending on stars known to harbour key photino bird flocks, cherry-red starbreaker beams shining like swords.
Xeelee had, with awesome determination, decided to modify their own evolutionary history in order to equip themselves for the battle with the photino birds.
The photino birds had not yet completed their vast conversion programmes - stars were still shining, the Ring not yet closed - but at last, in a time not very distant, the final light would be extinguished and the baryonic Universe would grow uniform and cold, a stable home for the photino birds.
In fact, Paul reflected wryly, this world should be safe even from the depredations of the photino birds.
Then at last it would come to rest, its only function being to serve as a gravitational seedbed for a photino bird Ghost world.
The photino birds were vastly more powerful, but the Qax, with their unswervable intent, represented the greater immediate danger.
Xeelee had returned to the cosmos, and - as Paul had hoped - the Xeelee nernesis, the dark matter photino birds, had come to find out what was going on.
So, Paul calculated, the Qax would have to get to the Ring and stop the photino birds from destroying it.
The photino birds, he realized, were now passing into the structure of the cosmic string itself.
Thanks to the activities of the photino birds the Ken-metric zone was like a pond into which gravel was being thrown.
Ring chamber: great gobbets of material showered from its surface, so that it left a trail like some impossible comet as it blazed, Paul saw, towards the throng of photino birds.