The Rizzoli in New York City was no ordinary bookstore in its seventies heyday.
Keith Richards' Life is an epic account of the heyday of rock 'n' roll.
Even a century after his heyday, Houdini has maintained the same mystique he enjoyed while living.
In its heyday, the miracle of AMC was always greater than the sum of its parts.
The place was a high-class dope den and crack was in its heyday.
Jack's face, when I told him about it, was so woebegone that I felt a stab of remorse, even in the heyday of my delight.
In the heyday of my youth I could fly around the world in five hours.
Page 11, restored chapter head poetry from Fireside Companion version and changed "heydey" to "heyday."
As for the princess—well, you're young; in the heyday for such nonsense.
She was rather tall than otherwise, and the contour of her head and shoulders denoted a girl in the heyday of youth and activity.
late 16c., alteration of heyda (1520s), exclamation of playfulness or surprise, something like Modern English hurrah, apparently an extended form of Middle Elish interjection hey or hei (see hey). Modern sense of "stage of greatest vigor" first recorded 1751, which altered the spelling on model of day, with which this word apparently has no etymological connection.