in an instant; in a flash

(physics) (attributive) transient

in a flash; twinkling; ephemeral

instantaneous

nictitating membrane (zoology)

in an instant; in a flash

in a flash; twinkling; ephemeral

(physics) (attributive) transient

instantaneous

nictitating membrane (zoology)

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

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

gazing fixedly (idiom)