ped/pedo (child)

child

Spelled ped, pedo, paed · pais, genitive paidos, 'child'; paideia 'education, upbringing'

Greek pais meant child: a pedagogue once escorted children to school; pediatric care treats children, and encyclopedia preserves the related idea of education.

Words built from it

pediatric — relating to medical care for children
Greek paid- (child) + iatr- (physician, healing) + -ic (relating to) → pediatric
pedagogue — a teacher, especially one who is overly strict or formal
Greek pais, paidos (child) + agogos (leader) → paidagogos (a child's attendant) → Latin paedagogus → pedagogue
encyclopedia — a reference work containing information about many subjects
Greek enkyklios (general, circular) + paideia (education), from pais (child) → Renaissance Latin encyclopaedia → encyclopedia
orthopedics — the branch of medicine concerned with bones, joints, and related structures
Greek orthos (straight) + paid- (child) → French orthopédie → English orthopedics

Looks like it, but is not

pedestrian — Comes from Latin pes, pedis, 'foot,' rather than Greek pais, paidos, 'child.'
pedometer — Its ped- means 'foot,' from Latin pes, pedis; the instrument counts steps, not children.

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More roots

path — feeling
ped — foot, walk
pel/puls — drive; push
pend/pens — hang, weigh, pay
phil — love