propulsatile
Serving to force the contents to move in a rapid outflow.
Lymph hearts of lower vertebrates are propulsatile organs, whose main function is to pump the lymph from subcutaneous lymph sacs into the venous system.
Where it comes from
From Medieval Latin propulsio (“term”), from Latin past participle of propello (“to drive forward, drive forth, drive away, drive out”).
Adapted from the Wiktionary entry propulsatile (CC BY-SA 4.0).