Wiktionary
selenoid
a. crescent shaped n. any satellite of the Earth's moon (none of which are known)
Usage examples of "selenoid".
Tibor rolled to the stove, relocked the cart's brake once more via the selenoid selector-relays, and sent his manual grippers to lift the pot.
As if something had been lifted from the sagging grasp of his combined manual extensors, a load which overstrained the metabattery and made the ominous black smoke rise from the transformer, gear box, and bank of selenoids of his cart.