1. A microscopic, barbed larval stage of freshwater mussels that attaches to fish gills or fins to complete its life cycle.
Usage: biology; zoology; plural: glochidia
2. A small, barbed hair or bristle found on certain plants, especially cacti, that readily detaches and adheres to skin or fur.
Usage: botany; plural: glochidia

Examples

• The glochidium of the mussel larvae must find a suitable fish host within a few days to survive.
• Freshwater mussels release thousands of glochidia into the water column during their reproductive season.
• The barbed glochidia clamp onto fish gills, where they develop into juvenile mussels.
• Cactus spines are often accompanied by tiny glochidia that can irritate skin.
• The glochidium stage is critical for the dispersal of mussel species across river systems.
• Biologists study glochidia to understand mussel population dynamics and fish-mussel interactions.