• a nonmetallic univalent element that is normally a colorless and odorless highly flammable diatomic gas; the simplest and lightest and most abundant element in the universe
Example sentence
• Water is composed of two hydrogen atoms and one oxygen atom.
• any of five related nonmetallic elements (fluorine or chlorine or bromine or iodine or astatine) that are all monovalent and readily form negative ions
Example sentence
• Iodine is a halogen that is commonly used as an antiseptic.
• any of a group of compounds that are inactive precursors of enzymes and require some change (such as the hydrolysis of a fragment that masks an active enzyme) to become active
Example sentence
• The zymogen is stored in the inactive form until it is needed for digestion.
• A swimming stroke in which the left and right hands are alternately raised out of the water, brought forward and drawn back through the water. A scissor kick is performed on every second stroke.
Example sentence
• The trudgen is a swimming stroke named after its innovator, English swimmer John Trudgen.
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