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We found 15 dictionaries with English definitions that include the word thingummy:
Click on the first link on a line below to go directly to a page where "thingummy" is defined.

General (14 matching dictionaries)

1. thingummy: Merriam-Webster.com [home, info]
2. thingummy: Oxford Dictionaries [home, info]
3. thingummy: Collins English Dictionary [home, info]
4. thingummy: Vocabulary.com [home, info]
5. Thingummy, thingummy: Wordnik [home, info]
6. thingummy: Cambridge Advanced Learner's Dictionary [home, info]
7. thingummy: Wiktionary [home, info]
8. thingummy: Dictionary.com [home, info]
9. thingummy: Rhymezone [home, info]
10. thingummy: Free Dictionary [home, info]
11. thingummy: Mnemonic Dictionary [home, info]
12. thingummy: WordNet 1.7 Vocabulary Helper [home, info]
13. thingummy: LookWAYup Translating Dictionary/Thesaurus [home, info]
14. thingummy: Dictionary/thesaurus [home, info]

Computing (1 matching dictionary)

15. thingummy: Encyclopedia [home, info]

(Note: See thingummies for more definitions.)

Quick definitions from WordNet (thingummy) ▸ noun:  something whose name is either forgotten or not known ▸ Also see thingummies ▸ Words similar to thingummy ▸ Usage examples for thingummy ▸ Popular adjectives describing thingummy ▸ Words that often appear near thingummy ▸ Rhymes of thingummy ▸ Invented words related to thingummy