English edit

Etymology edit

draft +‎ -proof

Adjective edit

draftproof (comparative more draftproof, superlative most draftproof)

  1. US standard spelling of draughtproof.

Verb edit

draftproof (third-person singular simple present draftproofs, present participle draftproofing, simple past and past participle draftproofed)

  1. US standard spelling of draughtproof.