hypoid gear

a gear resembling a bevel gear in form but designed to mesh with a similar gear in such a way that their axes would not intersect, one axis crossing over the other at approximately a right angle.

1925–30; hyp(erbol)oid

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World English Dictionary
hypoid gear (ˈhaɪpɔɪd)
a gear having a tooth form generated by a hypocycloidal curve; used extensively in motor vehicle transmissions to withstand a high surface loading
[C20: hypoid, shortened from hypocycloid]

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