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.
All antibiotics are grouped into classes by the pharmacological properties. Different antibiotics have different chemical compound and provide different action. Antibiotics classes: 1  Penicillin-a class including Amoxicillin, Ampicillin, Augmentin. 2  Penicillin provide bactericidal action. 3  Cephalosporin a class similar to Penicillin, used in treatment of bacteria resistant to Penicillin.