Eavestrough:
A rain gutter or surface water collection channel is a component of water discharge system for a building. Water from a pitched roof flows down into a valley gutter, a parapet gutter or an eaves gutter. An eaves gutter is also known as an eavestrough (especially in Canada), eaves channel, dripster, guttering or simply as a gutter. The word gutter derives from Latin gutta(noun), meaning “a drop, spot or mark”. [Wikipedia]
First heard in conversation yesterday.
