Nutation

Nu*ta"tion

(?), n. [L. nutatio a nodding, fr. nutare to nod: cf. F. nutation.] 1. The act of nodding.
[1913 Webster]

So from the midmost the nutation spreads,
Round and more round, o'er all the sea of heads.
Pope.
[1913 Webster]

2. (Astron.) A very small libratory motion of the earth's axis, by which its inclination to the plane of the ecliptic is constantly varying by a small amount.
[1913 Webster]

3. (Bot.) (a) The motion of a flower in following the apparent movement of the sun, from the east in the morning to the west in the evening. (b) Circumnutation.
[1913 Webster]

 

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Wed 12th December 2018