The Collaborative International Dictionary
Aclinic
Aclinic \A*clin"ic\ ([.a]*kl[i^]n"[i^]k), a. [Gr. 'a priv. +
kli`nein 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.
Wiktionary
aclinic
a. (context physics English) Without inclination or dipping.