1. A single-celled organism belonging to the phylum Euglenophyta, typically found in freshwater and characterized by the presence of a flagellum and chloroplasts.
Usage: biology; scientific

Examples

• The student observed a euglenid under the microscope during the biology lab.
• Euglenids are commonly used in educational settings to teach about protist movement.
• The pond water contained several species of euglenids that moved using their flagella.
• Euglenids can photosynthesize because they contain chloroplasts.
• In the absence of light, some euglenids can switch to heterotrophic nutrition.