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Definition of 'pedometer'. pedometer. A pedometer is a device that measures the distance that someone has walked. ...a small pager with a built-in pedometer to count the number of steps its owner took. COBUILD Advanced English Dictionary.
This front-back distinction looks very much like the same kind of ablaut variation one finds between, say, Greek [pi][omicron][delta][omicron][zeta](podos, with mid back rounded [o]; English cognate podiatrist) and Latin pedis (with mid front unrounded [e]; cognate pedestrian), both meaning foot, and both coming from the PIE root *ped-.