The Collaborative International Dictionary of English v.0.48:

Sideration \Sid`er*a"tion\, n. [L. sideratio.]
   The state of being siderated, or planet-struck; esp., blast
   in plants; also, a sudden and apparently causeless stroke of
   disease, as in apoplexy or paralysis. [Obs.] --Ray.
   [1913 Webster]