a. [ 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. [ 1913 Webster ]
Astatic pair (Magnetism),
adv. In an astatic manner. [ 1913 Webster ]
n. The state of being astatic. [ 1913 Webster ]