n. an optical instrument used to measure very small time intervals with precision
the GNU version of the Collaborative International Dictionary of English
n. An instrument for measuring minute intervals of time; used in determining the velocity of projectiles, the duration of short-lived luminous phenomena, etc.
The Century Dictionary and Cyclopedia
n. An instrument for measuring extremely short intervals of time. Specifically
n. An instrument for measuring the velocity of projectiles.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. an instrument for accurate measurements of small intervals of time
Word Usage
""He'd used a device he called a chronoscope to search the history of Earth."