Webster’s Revised Unabridged Dictionary · 1913
Pan-
Pan- (păn·), Pan′ta- (·tȧ·), Pan′to- (·tō·) . [Gr. πᾶς, m., πᾶν,neut., gen. παντός, all.] Combining forms signifying all, every; as, panorama, pantheism, pantagraph, pantograph. Pan- becomes pam- before b or p, as pamprodactylous.