1. the science or study of chemistry; chemical action or processes
Usage: archaic or formal; rarely used in modern English; 'chemistry' is the standard term
2. the chemical composition or properties of a substance
Usage: technical; dated

Examples

• The chemism of the mineral was analyzed in the laboratory.
• Early scholars studied the chemism of metals and their reactions.
• Understanding the chemism of water requires knowledge of hydrogen and oxygen bonding.
• The chemism involved in fermentation fascinated 19th-century scientists.