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helicograph

American  
[hel-i-koh-graf, -grahf] / ˈhɛl ɪ koʊˌgræf, -ˌgrɑf /

noun

  1. an instrument for drawing helices.


helicograph British  
/ -ˌɡræf, ˈhɛlɪkəʊˌɡrɑːf /

noun

  1. an instrument for drawing spiral curves

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of helicograph

First recorded in 1850–55; helico- + -graph