We found 17 dictionaries that define the word stiffer:

General (10 matching dictionaries)

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

Business (1 matching dictionary)

11. stiffer: Legal dictionary

Computing (1 matching dictionary)

12. stiffer: Encyclopedia

Medicine (2 matching dictionaries)

13. stiffer: Merriam-Webster Medical Dictionary
14. stiffer: Medical dictionary

Miscellaneous (1 matching dictionary)

15. stiffer: Idioms

Slang (2 matching dictionaries)

16. stiffer: Green’s Dictionary of Slang
17. stiffer: Urban Dictionary

(Note: See stiff as well.)

Definitions from Wiktionary (stiffer) ▸ noun:  (slang, vulgar) An erection of the penis. Similar: stiffy, stiffie, bone, boner, woodie, chubby, boneritis, throbber, lumber, boner-killer, more... Opposite: softer, more flexible, more pliable Types: marshmallow, jello, pudding, whipped cream, frosting, fudge, ice cream, gelatin, mousse, more... Colors:     steel gray,     charcoal,     gunmetal,     iron,     pewter, more... ▸ Words similar to stiffer ▸ Usage examples for stiffer ▸ Idioms related to stiffer ▸ Wikipedia articles (New!) ▸ Popular adjectives describing stiffer ▸ Words that often appear near stiffer ▸ Rhymes of stiffer ▸ Invented words related to stiffer