Definition of "discharging"

From the magnificent ejaculation of the Waimangu geyser, to the tiniest of gaseous emissions, descriptions of the thermal reserve were rife with dischargings, bubblings and stinkings, quiverings and palpitations, orifices and protuberances.

2013, Phaedra. C Pezzullo, Cultural Studies and Environment, Revisited, page 42