We found 17 dictionaries that define the word Manhattan Project:

General (13 matching dictionaries)

1. manhattan project: Longman Dictionary of Contemporary English
2. Manhattan Project: Oxford Learner's Dictionaries
3. Manhattan Project: Collins English Dictionary
4. Manhattan Project: Vocabulary.com
5. Manhattan Project: Wordnik
6. Manhattan Project: Infoplease Dictionary
7. Manhattan Project: Dictionary.com
8. Manhattan Project (album), Manhattan Project (disambiguation), Manhattan Project (film), Manhattan Project (song), Manhattan Project, Manhattan project, The Manhattan Project (Carter Ace EP), The Manhattan Project (Ugly Betty), The Manhattan Project (album), The Manhattan Project (film), The Manhattan Project: Wikipedia, the Free Encyclopedia
9. Manhattan project: Rhymezone
10. manhattan project: FreeDictionary.org
11. manhattan project: Mnemonic Dictionary
12. Manhattan Project: TheFreeDictionary.com
13. Manhattan Project: Wiktionary

Business (1 matching dictionary)

14. Manhattan Project: Energy Dictionary

Computing (1 matching dictionary)

15. Manhattan Project, The Manhattan Project: Encyclopedia

Slang (1 matching dictionary)

16. Manhattan Project: Urban Dictionary

Tech (1 matching dictionary)

17. Explosives (No longer online)

(Note: See manhattan_projects as well.)

Definitions from Wiktionary (Manhattan Project) ▸ noun:  A program by the United States during World War II, to develop an atomic bomb Similar: bomb, the bomb, A-bomb, atomic bomb, nuclear warfare, doomsday device, carpet bomb, button, nuclear war, firebombing, more... Opposite: peace project, disarmament project Types: Trinity test, Fat Man, Little Boy, ManhattProject, more... Phrases: Timeline of the Manhattan Project, British contribution to the Manhattan Project, Manhattan Project National Historical Park, African-American scientists and technicians on the Manhattan Project, more... Adjectives: bomb, thermobaric, postatomic, core, tertiary, iron, bomber, interstage, primary, secondary, retrofire ▸ Words similar to Manhattan Project ▸ Usage examples for Manhattan Project ▸ Idioms related to Manhattan Project ▸ Wikipedia articles (New!) ▸ Words that often appear near Manhattan Project ▸ Rhymes of Manhattan Project ▸ Invented words related to Manhattan Project