helmont

noun

1. Jan Bap·tis·ta van [yahn bahp tis-tah-vahn] /yɑn bɑp ˈtɪs tɑ vɑn/, 1579–1644, Flemish chemist and physician.

noun

1. Jean Baptiste van (ʒɑ̃ batist vɑn). 1577–1644, Flemish chemist and physician. He was the first to distinguish gases and claimed to have coined the word gas