We found 37 dictionaries that define the word plankton:

General (21 matching dictionaries)

1. plankton: Longman Dictionary of Contemporary English
2. plankton: Merriam-Webster
3. plankton: Oxford Learner's Dictionaries
4. plankton: American Heritage Dictionary of the English Language
5. plankton: Collins English Dictionary
6. plankton: Vocabulary.com
7. Plankton, plankton: Wordnik
8. plankton: Cambridge Advanced Learner's Dictionary
9. plankton: Wiktionary
10. plankton: Webster's New World College Dictionary, 4th Ed.
11. plankton: The Wordsmyth English Dictionary-Thesaurus
12. plankton: Infoplease Dictionary
13. plankton: Dictionary.com
14. plankton: Online Etymology Dictionary
15. Plankton (SpongeBob SquarePants), Plankton (Spongebob), Plankton (character), Plankton (disambiguation), Plankton: Wikipedia, the Free Encyclopedia
16. plankton: Rhymezone
17. plankton: FreeDictionary.org
18. plankton: Mnemonic Dictionary
19. plankton: TheFreeDictionary.com

Art (1 matching dictionary)

20. -plankton: A Cross Reference of Latin and Greek Elements

Computing (1 matching dictionary)

21. plankton: Encyclopedia

Medicine (3 matching dictionaries)

22. Medical Dictionary (No longer online)
23. online medical dictionary (No longer online)
24. plankton: Medical dictionary

Science (7 matching dictionaries)

25. Agricultural Thesaurus and Glossary (No longer online)
26. Botanical Terms (No longer online)
27. Tree of Life Glossary (No longer online)
28. Plankton: USGS Paleontology Glossary of Terms
29. plankton: Evolution Glossary
30. Atmospheric Chemistry and Air Quality (No longer online)
31. plankton: Natural History Terms

Slang (1 matching dictionary)

32. Plankton: Urban Dictionary

Tech (3 matching dictionaries)

33. Lake and Water Word Glossary (No longer online)
34. Schlumberger Oilfield Glossary (No longer online)
35. Glossary of Water Resource Terms (No longer online)

(Note: See planktonic as well.)

Definitions from Wiktionary ( ) ▸ noun:  (uncountable) Organisms, especially small and microscopic ones, that drift in water. ▸ noun:  (countable) A plankter, any single organism that drifts in water. Similar: aeroplankton, plankter, zooplankton, meroplankton, limnoplankton, pseudoplankton, microplankton, tychoplankton, potamoplankton, haliplankton, more... Opposite: nekton Types: diatom, phytoplankton, zooplankton, krill, copepod, more... Phrases: Plankton net, net plankton, plankton bloom, Plankton and Karen, Paradox of the plankton, more... Adjectives: marine, net, oceanic, microscopic, animal, total, freshwater, water, small, dead, tiny Colors:     green,     blue,     teal,     aqua,     turquoise, more... ▸ Word origin ▸ Words similar to plankton ▸ Usage examples for plankton ▸ Idioms related to plankton ▸ Wikipedia articles (New!) ▸ Popular adjectives describing plankton ▸ Words that often appear near plankton ▸ Rhymes of plankton ▸ Invented words related to plankton