We found 18 dictionaries that define the word pop3:

General (6 matching dictionaries)

1. POP3: Oxford Learner's Dictionaries
2. POP3, pop3: Cambridge Advanced Learner's Dictionary
3. POP3: Wiktionary
4. POP3: Dictionary.com
5. POP3, Pop3: Wikipedia, the Free Encyclopedia
6. POP3: Stammtisch Beau Fleuve Acronyms

Business (1 matching dictionary)

7. WebmasterWorld Webmaster and Search Engine Glossary (No longer online)

Computing (6 matching dictionaries)

8. POP3: Free On-line Dictionary of Computing
9. POP3: Tech Terms Computer Dictionary
10. POP3: Hacking Lexicon
11. Data Formats and Their Sugggested File Extensions (No longer online)
12. I T Glossary (No longer online)
13. POP3: Encyclopedia

Medicine (1 matching dictionary)

14. online medical dictionary (No longer online)

Miscellaneous (2 matching dictionaries)

15. POP3: Acronym Finder
16. AbbreviationZ (No longer online)

Slang (1 matching dictionary)

17. pop3: Urban Dictionary

Tech (1 matching dictionary)

18. POP3: Webster's New World Telecom Dictionary

Definitions from Wiktionary (POP3) ▸ noun:  (computing) Acronym of Post Office Protocol version 3 standard for receiving Internet email. Similar: IMAP, SMTP, webmail, NNTP, Sendmail, telnet, SNTP, SASL, maildrop, postfix, more... ▸ Words similar to pop3 ▸ Usage examples for pop3 ▸ Idioms related to pop3 ▸ Wikipedia articles (New!) ▸ Popular adjectives describing pop3 ▸ Words that often appear near pop3 ▸ Rhymes of pop3 ▸ Invented words related to pop3