D defs.my
Entry 1 sense Webster, 1913

Isoclinal

· I·so·cli·nal · IPA
01 a. Of or pertaining to, or indicating, equality of inclination or dip; having equal inclination or dip.
  1. 1.
    Of or pertaining to, or indicating, equality of inclination or dip; having equal inclination or dip.
Phrases & compounds
Isoclinal lines — lines on the earth's surface connecting places at which a dipping needle indicates the same inclination or dip.