English
inkproof
From ink + -proof.
Formed from ink + -proof
Ancient Greek ἔγκαυστον ‘burned-in’
Latin encaustum ‘purple ink used by Roman emperors to sign…’
Old French enque
Middle English ynke
English ink
Today it means
adj Resistant to ink stains.
Language periods are conventional ranges, not dates for this word.
Etymograph / inkproof