photomatoncommon nounSyllable DecompositionphotomatonEtymologyexpandThis portmanteau word is composed of the prefix photo-, automate (whose first two syllables undergo a rich crasis with the prefix), and the suffix -on.Definitions1. Automatic booth for identity photography with instant development, installed in train stations, the metro, shopping centers, or administrative offices.expand2. Identity photo taken with this device.expandPluralphotomatons