English Etymology Etymology tree▲Old French cancelerbor.Anglo-Norman cancelerbor.Middle English cancellenEnglish cancelProto-Indo-European *h₃erbʰ-Proto-Indo-European *-osProto-Indo-European *h₃órbʰosProto-Balto-Slavic *árbasProto-Slavic *orbъProto-Indo-European *-yetiProto-Indo-European *-éyetiProto-Balto-Slavic *-éiteiProto-Slavic *-itiProto-Slavic *orbitiProto-Indo-European *-otéh₂Proto-Balto-Slavic *-atā́ˀProto-Slavic *-otaProto-Slavic *orbotaOld Czech robotaCzech robotaCzech robotbor.English robotclip.English botEnglish -botEnglish cancelbotFrom cancel + -bot. Pronunciation Audio (UK):(file) Noun cancelbot (plural cancelbots) (Internet) A bot that sends messages to Usenet newsgroups to remove certain postings, especially spam. See also spambot