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propeller
nounfemininetechnicalcommon/ˈɛlisɨ/hé·li·ce
Definitions
21
A mechanical device consisting of two or more curved blades fixed to a central shaft, which, when rotated, produces thrust in a fluid (such as air or water) for propulsion or lift.
Usage examples
“The airplane's propeller began to spin before takeoff.”
“The boat has a three-bladed propeller.”
Common combinations
airplane propellerboat propellerpropeller bladepropeller shaft
2
A three-dimensional curve that advances around an axis, like the shape of a spring or a spiral staircase (geometric sense).
Usage examples
“The DNA molecule has the shape of a double helix.”
“The spiral staircase describes a helix.”
Common combinations
double helixhelical shapecylindrical helix