he·lic·i·ty 
(hə-lĭsĭ-tē, hē′)
(hə-lĭsĭ-tē, hē′)n. pl. he·lic·i·ties
Physics
Physics
1. The projection of a particle's spin vector in the direction of its momentum vector, being positive if it points in the same direction, and negative if it points in the opposite direction. Helicity is the chirality of the particle's spin.
2. An instance of such projection.
- peripheral arterial disease
- peripheral artery disease
- peripherally
- peripheral nervous system
- peripheral neuropathy
- peripheral vascular disease
- periphery
- periphrasis
- periphrastic
- periphrastically
- periphyton
- periplasm
- periplasmic
- periproct
- peripteral
- perique
- perisarc
- periscope
- periscopic
- periscopical
- perish
- perishability
- perishable
- perishableness
- perishably