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pan-

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  1. 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.
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Also pant-, panto-.

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. 2018

British Dictionary definitions for pan-

pan-

combining form
  1. all or everypanchromatic
  2. including or relating to all parts or membersPan-African; pantheistic
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Word Origin

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

Word Origin and History for pan-

word-forming element meaning "all, every, whole, all-inclusive," from Greek pan-, combining form of pas (neuter pan, masculine and neuter genitive pantos) "all," from PIE *pant- "all" (with derivatives found only in Greek and Tocharian).

Commonly used as a prefix in Greek, in modern times often with nationality names, the first example of which seems to have been Panslavism (1846). Also panislamic (1881), pan-American (1889), pan-German (1892), pan-African (1900), pan-European (1901), pan-Arabism (1930).

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Online Etymology Dictionary, © 2010 Douglas Harper

pan- in Medicine

pan-

pref.
  1. All:panagglutinins.
  2. General; whole:panimmunity.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.