Word Study
snowplough
CIDE DICTIONARY
snowplough, n.
An implement operating like a plow, but on a larger scale, for clearing away the snow from roads, railways, etc. [1913 Webster]
OXFORD DICTIONARY
snowplough, n. (US snowplow) a device, or a vehicle equipped with one, for clearing roads of thick snow.
For further exploring for "snowplough" in Webster Dictionary Online