n.1 a person or thing that shakes.
2 a container for shaking together the ingredients of cocktails etc.
3 (Shaker) a member of an American religious sect living simply, in celibate mixed communities.
Derivatives:
Shakeress n. (in sense 3). Shakerism n. (in sense 3).
Etymology: ME, f. SHAKE: sense 3 from religious dances