phonic wheel
noun
A toothed disc or rotor of magnetic material which is caused to rotate at a constant speed by an electromagnet energized by alternating or interrupted direct current (originally derived from a tuning fork vibrating against a contact and sustained by another electromagnet).
Origin
Late 19th century; earliest use found in Telegraphic Journal. After French roue phonique.
- strengthen someone's hand (or hands)
- strengthful
- strengthily
- strengthing
- strengthless
- strength-to-weight ratio
- strength/weight ratio
- strengthy
- strenuous
- strenuously
- strenuousness
- strep
- Strepsiptera
- strepsipteran
- strep throat
- strepto-
- streptocarpus
- streptococcal
- streptococcus
- streptokinase
- streptomycete
- streptomycin
- stress
- stress ball
- stress buster