1. in a way that relates to chemistry or involves chemical processes
2. by means of chemicals or chemical reactions

Examples

• The water was chemically treated to remove impurities.
• These two substances are chemically identical.
• The wood was chemically preserved to prevent decay.
• The soil was chemically analyzed for nutrient content.
• The fabric was chemically bleached to achieve the white color.
• These compounds react chemically when mixed together.