Wiktionary
two-start
a. 1 (context mathematics in two dimensions English) Describing a double spiral that starts at the origin and divides the plane into two 2 (context mathematics in three dimensions English) Describing a construction of two helix that wrap around the same cylinder; if infinite, would divide the surface of the cylinder into two alt. 1 (context mathematics in two dimensions English) Describing a double spiral that starts at the origin and divides the plane into two 2 (context mathematics in three dimensions English) Describing a construction of two helix that wrap around the same cylinder; if infinite, would divide the surface of the cylinder into two