Apps

Mozilla Firefox

Blog Help Center Contact

Apps

iPhone + iPad

Help Center, release notes, Download

Mac + Safari

Help Center, release notes, Download

Google Chrome

Help Center, Download

Mozilla Firefox

Help Center, Download

Opera

Help Center, Download

Microsoft Edge

Help Center, Download

Support

Download Help Center Supported languages Request a refund Restore password Restore serial codes Privacy policy

STAY IN TOUCH

Contact Twitter Blog

Site language

free services

Web translator Verb conjugator Der Die Das lookup Usage examples Words Definition Idioms

Apps

Mozilla Firefox

Blog Help Center Contact

Apps

iPhone + iPad

Help Center, release notes, Download

Mac + Safari

Help Center, release notes, Download

Google Chrome

Help Center, Download

Mozilla Firefox

Help Center, Download

Opera

Help Center, Download

Microsoft Edge

Help Center, Download

Support

Download Help Center Supported languages Request a refund Restore password Restore serial codes Privacy policy

STAY IN TOUCH

Contact Twitter Blog

Site language

free services

Web translator Verb conjugator Der Die Das lookup Usage examples Words Definition Idioms

Definition of "casein" in English

noun

(biochemistry) A protein present in both milk and in the seeds of leguminous plants.