1. A salt or ester of orthophosphoric acid, containing the phosphate ion PO₄³⁻ or a related group; a form of inorganic phosphate commonly found in biological and environmental systems.
Usage: chemistry; biochemistry; environmental science

Examples

• Orthophosphate is an essential nutrient for plant growth and is often added to fertilizers.
• The water sample tested positive for orthophosphate, indicating possible agricultural runoff.
• Cells use orthophosphate to synthesize ATP and other energy-rich compounds.
• Orthophosphate ions are the primary form of phosphate available to aquatic organisms.
• The treatment process removes excess orthophosphate from wastewater before discharge.
• Orthophosphate concentrations in soil affect nutrient availability for crops.