Graphology - the study of handwritings; autograph - written with one's own hand; seismograph - a machine noting strength and duration of earthquakes. marina - a harbor for pleasure boats; maritime - relating to the sea; submarine - an undersea boat; aquamarine - color of sea water.
Chemicals are classified into various hazard classifications in accordance with their physiochemical properties and health hazards. Each class of chemical has a pictorial symbol called a danger symbol.
chemical. n. 1. (Chemistry) any substance used in or resulting from a reaction involving changes to atoms or molecules, especially one derived artificially for practical use. adj. 2. (Chemistry) of or used in chemistry: chemical balance. 3. (Chemistry) of, made from, or using chemicals: chemical fertilizer.