-proof


-proof

adj combining form secure against (damage by); (make) impervious to: waterproof; mothproof; childproof. [from proof (adj)]

proof

(pruf)

n. 1. evidence sufficient to establish a thing as true or believable. 2. anything serving as such evidence. 3. the act of testing or trying anything; test; trial: to put a thing to the proof. 4. the establishment of the truth of anything; demonstration. 5. (in judicial proceedings) evidence that seems to substantiate or corroborate a charge or allegation. 6. an arithmetical operation serving to check the correctness of a calculation. 7. Math., Logic. a sequence of steps, statements, or demonstrations that leads to a valid conclusion. 8. a test to determine the quality, durability, etc., of materials used in manufacture. 9. the strength of an alcoholic liquor, esp. with reference to the standard whereby 100 proof signifies an alcoholic content of 50 percent. 10. Photog. a trial print from a negative. 11. Print. a. a trial impression, as of composed type, taken to correct errors and make alterations. b. one of a number of early and superior impressions taken before the printing of the ordinary issue. 12. one of a limited number of coins of a new issue struck from polished dies on a blank having a polished or matte surface. 13. the state of having been tested. adj. 14. able to withstand; impenetrable, impervious, or invulnerable: proof against attack; proof against leakage. 15. used for testing or proving; serving as proof. 16. of standard strength, as an alcoholic liquor. 17. of tested or proven strength or quality: proof armor. v.t. 18. to examine for flaws, errors, etc.; check against a standard. 19. Print. prove (def. 7). 20. proofread. 21. to treat or coat for the purpose of rendering resistant to deterioration, damage, etc. (often used in combination). 22. a. to combine (yeast) with warm water so that a bubbling action occurs. b. to cause (bread dough, etc.) to rise by adding baker's yeast. v.i. 23. (of yeast) to bubble or foam when mixed with warm water, milk, etc. [1175–1225; Middle English prove, prooff, alter. (by association with the vowel of prove) of preove, pref < Middle French preve, proeve < Late Latin proba a test, n. derivative of Latin probāre to approve of, examine, prove]

-proof

a combining form of proof, with the meaning “resistant, impervious to” that specified by the initial element: childproof; waterproof.