|a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.|
|a chattering or flighty, light-headed person.|
|Huygens (hī'gənz, hoi'gěns) Pronunciation Key
Dutch physicist and astronomer who in 1655 discovered Saturn's rings and its fourth satellite, using a telescope he constructed with his brother. In 1657 he built the first pendulum clock. Huygens also proposed that light consists of transverse waves that vibrate up and down perpendicular to the direction in which the light travels. This theory, which explained some properties of light better than Newton's theory, was made public in 1690.