a combining form meaning “all,” occurring originally in loanwords from Greek (panacea; panoply), but now used freely as a general formative (panleukopenia; panorama; pantelegraph; pantheism; pantonality), and especially in terms, formed at will, implying the union of all branches of a group (Pan-Christian; Panhellenic; Pan-Slavism). The hyphen and the second capital tend with longer use to be lost, unless they are retained in order to set off clearly the component parts.
Origin of pan-
< Greek pan- combining form of pâs (neuter pân) all, every, pân everything
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for pan-
all or everypanchromatic
including or relating to all parts or membersPan-African; pantheistic
Word Origin for pan-
from Greek pan, neuter of pas all
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Medicine definitions for pan-
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.