The Collaborative International Dictionary
Pedo-
Pedi- \Ped"i-\, Pedo- \Ped"o-\ [See Foot.] Combining forms from L. pes, pedis, foot, as pedipalp, pedireme, pedometer.
Douglas Harper's Etymology Dictionary
pedo-
before vowels ped-, word-forming element meaning "boy, child," from Greek pedo-, comb. form of pais "boy, child," especially a son, from PIE root *peu- "small, little, few, young" (see few (adj.)). The British form paed- is better because it avoids confusion with ped-.
Wiktionary
pedo-
Etymology 1 alt. relating to children pre. relating to children Etymology 2
pre. relating to soil