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Tradition had taught that arteries had an active "pulsatory force", but Harvey realised they were passive, like the lead pipes of London's rapidly developing water system.

It is evident that a pulsatory as well as an alternating current might be used to drive or operate the motors above described.

Systaltic, sis-tal′tik, adj. alternately contracting and dilating, pulsatory.

Then he touched a valve, and the machine became animate with a low pulsatory wheezing, while something commenced to hum and rattle inside it.

The odds and ends on the table beside him were rattling merrily, and a deep pulsatory humming rang stridently through the silence of the swamps.