centripetal » centripedal
Spotted in the wild:
- “.. centripedal force and something called the center of gravity … This is called centripedal force and it causes the object to take a circular path, …” (www.nasa.gov/vision/earth/ everydaylife/SUV_Rollover_test.html)
Presumably with stress on the second syllable, so a result of intervocalic flapping neutralizing /t/ and /d/, represented in spelling by a “d”. Still, the “pedal” element might be a move towards something having to do with feet.
On 28 November 2004 I got 720 (raw, unexamined) Google web hits for “centripedal”, as against 6,260 for “centrifical” (q.v.) in place of “centrifugal”.