We do not currently know of any antonyms for glochid.
The noun glochid is defined as:
a form of small, detachable, irritantspineoccurring in denseclusters in the areoles of certain cacti such as prickly pear. Typically glochids are short, straight, and microscopically barbed. When stuck into the skin of anyone touching the plant, they detach and remain in the skin when the victim moves away.