Etymology
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astatic (adj.)

"unsteady, unstable, taking no fixed position," 1827, with -ic + Greek astatos "unstable, not steadfast," from a- "not, without" (see a- (3)) + statos "placed, standing," from PIE root *sta- "to stand, make or be firm." Related: Astatically.

updated on April 18, 2017

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Definitions of astatic from WordNet

astatic (adj.)
not static or stable;
From wordnet.princeton.edu, not affiliated with etymonline.