A sand-glass used for determining the time in boiling eggs.(noun)
An apparatus for the automatic cooking of eggs.(noun)
The Century Dictionary (Public Domain)
Use "egg-timer" in a sentence
"Try the Pomodoro Technique, which takes its name from a tomato-shaped egg-timer."
"It reminds me of first arriving here and moving into a furnished apartment where my husband and I were thrilled to discover a truly Gallic kitchen: no kettle, no egg-timer, but instead a stove-top espresso pot, a tagine dish and—the height of sophistication—a wine thermometer."
"I'd always seen life as an egg-timer sitting precariously on the edge of a table — time slips away or it falls and everything smashes."