Englishfor English speakers
crescent
Noun
—
Crescent is the shape of the moon during its first or last quarter, with concave and convex edges ending in points.
laser
Noun
—
A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation.
—
The term laser originated as an acronym for "light amplification by stimulated emission of radiation".