Webster's Revised Unabridged Dictionary · 1913

Isoclinal

Isoclinal , adjective

[Iso- + Greek {not transcribed} to incline.]

Of or pertaining to, or indicating, equality of inclination or dip; having equal inclination or dip.
Collocations (1)
Isoclinal lines (Magnetism) , lines on the earth's surface connecting places at which a dipping needle indicates the same inclination or dip.

Also: Isoclinic