split second

to wink

one instant; very short time; the twinkle of an eye

(idiom) fleeting; transitory

(physics) (attributive) transient

in a flash; twinkling; ephemeral

instantaneous

nictitating membrane (zoology)

in a blink; in a twinkling

in the twinkling of an eye; in a flash; to turn one's eyes

gazing fixedly (idiom)

prompt neutron

prompt radiation

in an instant a myriad changes (idiom); rapid substantial change

(idiom) in the wink of an eye; in a flash

prompt radiation

teleportation