We found 31 dictionaries that define the word planking:

General (24 matching dictionaries)

1. planking: Longman Dictionary of Contemporary English
2. planking: Merriam-Webster
3. planking: Oxford Learner's Dictionaries
4. planking: The Word Spy
5. planking: American Heritage Dictionary of the English Language
6. planking: Collins English Dictionary
7. planking: Vocabulary.com
8. Planking, planking: Wordnik
9. planking: Cambridge Advanced Learner's Dictionary
10. planking: Wiktionary
11. planking: Webster's New World College Dictionary, 4th Ed.
12. planking: The Wordsmyth English Dictionary-Thesaurus
13. planking: Infoplease Dictionary
14. Planking, planking: Dictionary.com
15. Planking (disambiguation), Planking (fad), Planking: Wikipedia, the Free Encyclopedia
16. Planking: Online Plain Text English Dictionary
17. planking: Webster's Revised Unabridged, 1913 Edition
18. planking: Rhymezone
19. Planking: AllWords.com Multi-Lingual Dictionary
20. planking: FreeDictionary.org
21. planking: Mnemonic Dictionary
22. planking: TheFreeDictionary.com

Computing (2 matching dictionaries)

23. Technopedia (No longer online)
24. planking: Encyclopedia

Medicine (1 matching dictionary)

25. online medical dictionary (No longer online)

Miscellaneous (1 matching dictionary)

26. planking: Idioms

Slang (1 matching dictionary)

27. Planking: Urban Dictionary

Tech (2 matching dictionaries)

28. SeaTalk Dictionary of English Nautical Language (No longer online)
29. Planking: Latitude Mexico

(Note: See plank as well.)

Definitions from Wiktionary ( ) ▸ noun:  A series of planks; a group of planks. ▸ noun:  The practice of lying face down with arms to the sides, in unusual public spaces, and taking photographs to record the act. Similar: board, plunk, plop, plonk, flump, plump down, plump, plank over, plunk down, planching, more... Opposite: sitting, standing, lying down, slouching, reclining Phrases: strip planking, planking might shred them, more... Adjectives: wooden, heavy, inch, outside, bottom, rough, outer, thick, thin, double, inner Colors:     brown,     beige,     tan,     mahogany,     chestnut, more... ▸ Words similar to planking ▸ Usage examples for planking ▸ Idioms related to planking ▸ Wikipedia articles (New!) ▸ Popular adjectives describing planking ▸ Words that often appear near planking ▸ Rhymes of planking ▸ Invented words related to planking