تِرْس: دُولاَبٌ مُسَنّن gear, cogwheel, sprocket wheel; pinion

تِرْسُ الإدَارَة driving wheel; steering wheel

تِرْسٌ تَفَاضُلِيّ differential gear, differential

عُلْبَةُ التّرُوس transmission, gearbox