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.
-Â·tries. 1  the science dealing with the composition and properties of substances, and with the reactions by which substances are produced from or converted into other substances. 2  the application of this to a specified subject or field of activity. 3  the chemical properties, composition, reactions, and uses of a substance.