The American Heritage® Dictionary of the English Language, 4th Edition
interjection. Used as a toast to someone's health while drinking.
the GNU version of the Collaborative International Dictionary of English
interjection. Lit., may it do (you) good; -- a salutation used in well wishing, esp. among Germans, as in drinking healths; -- also used in the contracted form prost.
The Century Dictionary and Cyclopedia
Good luck to you: a salutation used in drinking healths and otherwise among Germans and Scandinavians, especially among university students.
Word Usage
"Sed nihil erucae faciunt bulbique salaces; Improba nec prosit jam satureia tibi."