2. (Astrol.)
Defn: Affecting unfavorably by the supposed influence of the stars; baleful. "Sideral blast." Milton.
SIDERATED Sid"er*a`ted, a. Etym: [L. sideratus, p. p. of siderari to be blasted by a constellation, fr. sidus, sideris, a constellation.]
Defn: Planet-struck; blasted. [Obs.]
SIDERATION
Sid`er*a"tion, n. Etym: [L. sideratio.]
Defn: 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.
SIDEREAL Si*de"re*al, a. Etym: [L. sidereus, from sidus, sideris, a constellation, a star. Cf. Sideral, Consider, Desire.]
1. Relating to the stars; starry; astral; as, sidereal astronomy.
2. (Astron.)
Defn: Measuring by the apparent motion of the stars; designated, marked out, or accompanied, by a return to the same position in respect to the stars; as, the sidereal revolution of a planet; a sidereal day. Sidereal clock, day, month, year. See under Clock, Day, etc. — Sideral time, time as reckoned by sideral days, or, taking the sidereal day as the unit, the time elapsed since a transit of the vernal equinox, reckoned in parts of a sidereal day. This is, strictly, apparent sidereal time, mean sidereal time being reckoned from the transit, not of the true, but of the mean, equinoctial point.