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The Collaborative International Dictionary
Helispheric

Helispheric \Hel`i*spher"ic\, Helispherical \Hel`i*spher"ic*al\, a. [Helix + spheric, spherical.] Spiral.

Helispherical line (Math.). the rhomb line in navigation.

Wiktionary
helispheric

a. spiral