GNU Collaborative International Dictionary of English
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Aclinic (ȧ‑klĭnˈĭk), a. [Gr. ἀ priv. + κλίνειν to incline.] (Physics.) Without inclination or dipping; -- said of the imaginary line near the earth's equator on which the magnetic needle balances itself horizontally, having no dip. The aclinic line is also termed the magnetic equator. Prof. August.
[1913 Webster]