n.
1.English scientist who formulated the law of elasticity and proposed a wave theory of light and formulated a theory of planetary motion and proposed the inverse square law of gravitational attraction and discovered the cellular structure of cork and introduced the term `cell' into biology and invented a balance spring for watches (1635-1703)
Idiom of the Day
keep one's shirt on
to remain calm, to keep from losing one`s temper or becoming too impatient
"Try and keep your shirt on! Everything will be fine in a few minutes."