different between nutation vs nutator

English

1610s, from Latin n?t?ti? (“nodding”), from n?t? (“I nod”). Compare mutation.

nutation (countable and uncountable, plural nutations)

(physics) A bobbing motion that accompanies the precession of a spinning rigid body.
A nodding motion (of the head etc.).
(astronomy) Any of several irregularities in the precession of the equinoxes caused by varying torque applied to the Earth by the Sun and the Moon.
(botany) The circular motion of the tip of a growing shoot.

nutator (plural nutators)

A mechanical or electronic device for gyrating a feedhorn, dipole, or radar about the axis of the reflector without changing its polarization.

n?t?tor

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