self-opening en · ADJ
Etymology
From self- + opening.
Meanings
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(not-comparable, qualifier:Of an object) that opens, or is designed to open automatically, or opens of its own accord.
Special features enable the cars to be used as mobile classrooms; equipment includes a microphone and inter-car broadcasting equipment, self-opening doors, fluorescent lights, illuminated speedometer, carton disposal units and a folding bed which normally serves as seats on either side of a table.
1963 January, “New in Japan: A Vista-car special”, in Modern Railways, page 44: