wiper arm

Từ điển Oxford Learners Wordfinder Dictionary

noun

contact consisting of a conducting arm that rotates over a series of fixed contacts and comes to rest on an outlet
• Syn:
wiper, contact arm
• Derivationally related forms:
wipe (for: wiper)
• Hypernyms:
contact, tangency
• Part Holonyms:
rheostat, variable resistor, selector, selector switch