1. An apparatus to supply oxygen to a person in an environment that lacks air; a device to aid breathing: An aerophore is necessary for supplying air to workers in mines with certain toxic fumes, or for supplying oxygen to divers in deep water.
2. A portable apparatus containing compressed air used to resuscitate newborn babies who fail to breathe at birth: Janet's baby had to be attached to an aerophonre so that breathing could be successfully assured.