a cylindrical gear wheel whose teeth follow the pitch surface in a helical manner.
a cylindrical gearwheel having the tooth form generated on a helical path about the axis of the wheel
[hel-i-kuh l, hee-li-] /ˈhɛl ɪ kəl, ˈhi lɪ-/ adjective 1. pertaining to or having the form of a ; spiral. /ˈhɛlɪkəl/ adjective 1. of or shaped like a helix; spiral adj. “spiral-shaped,” 1590s, from Latin helicem (see helix) + -al (1). helical hel·i·cal (hěl’ĭ-kəl, hē’lĭ-) adj.
noun 1. a rack having teeth set at an oblique angle to the edges. Compare 1 (def 5).
- Helical scan
noun 1. (modifier) denoting a recording technique used with video tapes in which the recorded tracks on the tape are segments of a helix: a helical-scan tape
[hel-i-keys, hee-li‐] /ˈhɛl ɪˌkeɪs, ˈhi lɪ‐/ noun, Biochemistry. 1. any of the enzymes that use the energy derived from the hydrolysis of nucleoside triphosphates to unwind the double-stranded helical structure of nucleic acids: RNA and DNA helicases.