The Collaborative International Dictionary
Pulmograde
Pulmograde \Pul"mo*grade\, a. [L. pulmo a lung + gradi to walk.] (Zo["o]l.) Swimming by the expansion and contraction, or lunglike movement, of the body, or of the disk, as do the medus[ae].
Wiktionary
pulmograde
a. (context zoology English) swim by means of expansion and contraction.