We found 10 dictionaries that define the word stiffens:

General (9 matching dictionaries)

1. stiffens: Merriam-Webster
2. stiffens: Collins English Dictionary
3. stiffens: Vocabulary.com
4. Stiffens, stiffens: Wordnik
5. stiffens: Cambridge Advanced Learner's Dictionary
6. stiffens: Wiktionary
7. stiffens: Dictionary.com
8. stiffens: Cambridge Essential American English Dictionary
9. stiffens: TheFreeDictionary.com

Business (1 matching dictionary)

10. stiffens: Legal dictionary

(Note: See stiffen as well.)

Definitions from Wiktionary (stiffen) ▸ verb:  (transitive) To make stiff. ▸ verb:  (intransitive) To become stiff. ▸ Also see stiffen Types: gelatin, agar agar, carrageenan, xanthgum, pectin, guar gum, more... ▸ Words similar to stiffens ▸ Usage examples for stiffens ▸ Idioms related to stiffens ▸ Wikipedia articles (New!) ▸ Words that often appear near stiffens ▸ Rhymes of stiffens ▸ Invented words related to stiffens