hydrogen Hydrogen is a colourless gas that is the lightest and commonest element in the universe. n-uncount
hydrogen bomb ( hydrogen bombs plural ) A hydrogen bomb is a nuclear bomb in which energy is released from hydrogen atoms. n-count
Hydrogen peroxide is a chemical that is often used to make hair lighter or to kill germs. n-uncount
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"Collins Cobuild English Dictionary for Advanced Learners 4th edition published in 2003 © HarperCollins Publishers 1987, 1995, 2001, 2003 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"