oxygen
Cross references:
1. element
ox.y.gen \'a:k-si-j*n\ \.a:k-si-'jen-ik\ \-j*-'nis-*t-e-\ n [F oxyge'ne,
fr. Gk oxys, adj., acid, lit., sharp + F -ge'ne often attrib X -gen; akin
to L acer sharp - more at EDGE : an element that is found free as a
colorless tasteless odorless gas in t he atmosphere of which it forms about
21 percent or combined in water, in most rocks and minerals, and in
numerous organic compounds, that is capable of combining with all elements
except the inert gases, is active in physiological processes, and is
involved esp. in combustion processes - ox.y.gen.ic aj