We found 13 dictionaries that define the word long tons:

General (7 matching dictionaries)

1. long tons: Merriam-Webster
2. long tons: Collins English Dictionary
3. long tons: Vocabulary.com
4. long tons: Cambridge Advanced Learner's Dictionary
5. long tons: Wiktionary
6. Long tons: Wikipedia, the Free Encyclopedia
7. Long tons: TheFreeDictionary.com

Business (3 matching dictionaries)

8. Abbreviations in shipping (No longer online)
9. Long tons: Legal dictionary
10. Long tons: Financial dictionary

Computing (1 matching dictionary)

11. Long tons: Encyclopedia

Medicine (1 matching dictionary)

12. Long tons: Medical dictionary

Miscellaneous (1 matching dictionary)

13. Long tons: Idioms

(Note: See long_ton as well.)

Definitions from Wiktionary (long ton) ▸ noun:  (chiefly historical) A traditional unit of mass equal to 20 hundredweights of 112 pounds avoirdupois each, equivalent to approximately 1016 kilograms. ▸ Also see long_ton ▸ Words similar to long tons ▸ Usage examples for long tons ▸ Idioms related to long tons ▸ Wikipedia articles (New!) ▸ Words that often appear near long tons ▸ Rhymes of long tons ▸ Invented words related to long tons