Hel′i‐spher″ic (?), Hel′i‐spher″ic‐al (�), a. [Helix + spheric, spherical.] Spiral.
Helispherical line(Math.). the rhomb line in navigation.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.