1. past tense and past participle of defoam; to remove foam from a liquid or surface
Usage: technical; industrial

Examples

• The technician defoamed the reactor vessel before starting the next batch.
• After the chemical reaction, the mixture was defoamed to improve clarity.
• The wastewater treatment plant defoamed the effluent using mechanical methods.
• The coating was defoamed to eliminate air bubbles before application.