Definify.com
Webster 1913 Edition
Astatic
A-stat′ic
,Adj.
[Pref.
a-
not + static
.] (Magnetism)
Having little or no tendency to take a fixed or definite position or direction: thus, a suspended magnetic needle, when rendered astatic, loses its polarity, or tendency to point in a given direction.
Astatic pair
(Magnetism)
, a pair of magnetic needles so mounted as to be nearly or quite astatic, as in some galvanometers.