The spelling of the word "PAED" with three letters might seem odd to some, but it is actually a valid alternative to the more common spelling "PED". In phonetic transcription, we can use /pi:d/ to represent the sound of the long "ee" vowel in the word, and the "d" sound is represented by /d/. This spelling is often used in British English and derived from the Greek word "paideia" meaning "education". Despite their differences, both spellings of this word have the same pronunciation.
For words so beginning see under ped.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.