/dʒɛfɪ/ or /geɪfɪ/ (as a unit of measurement) or /ɡɛf/ (as a unit of acceleration)

Definitions

1. noun

a unit of measurement for the flow of water or gas, equal to a gallon per hour

“The well produced 10 gph of water.”

2. noun

a unit of measurement for acceleration, specifically, a unit of acceleration equal to one centimeter per second squared

“The acceleration was measured in gph.”