1. Small, dense, protein-rich bodies found in the chloroplasts of certain algae and plants, typically associated with starch storage and photosynthesis.
Usage: biology; plural form of pyrenoid; commonly found in green algae and some lower plants

Examples

• The chloroplasts of Chlamydomonas contain prominent pyrenoids that aid in carbon fixation.
• Pyrenoids are structures where starch accumulates in many algal species.
• Under the microscope, the pyrenoids appeared as distinct granules within the chloroplast.
• The presence of pyrenoids is a characteristic feature of certain green algae.
• Scientists study pyrenoids to understand photosynthetic efficiency in algae.