Etymology: < helico-, combining form of Greek ἕλιξhelixn. + -metrycomb. form.
Geometry.
The measurement of spirals.
ΚΠ
1706 Phillips's New World of Words (new ed.) Helicometry, or Helicosophy, a Mathematical Art, which teaches how to measure or draw all Spiral Lines upon a Plain, and shews their respective Properties.
1811 Encycl. Londinensis (at cited word)
This entry has not yet been fully updated (first published 1898; most recently modified version published online September 2018).