IPA: /ˈhɛd.reɪs/
KK: /ˈhɛdˌreɪs/
A channel or stream that directs water to a mill or turbine to generate power.
The old mill used a headrace to bring water from the river to turn its wheel.
Headrace is formed from "head" (from Old English "heafod", meaning the upper part or leader) and "race" (from Old Norse "rǫk", meaning a channel or course). The term refers to the upper part of a watercourse or channel, often leading to a mill or waterwheel.
Think of the 'head' as the upper part or leader of a watercourse, and 'race' as a channel — together, they describe the leading channel of water.