Definitions

1. noun

A plant structure that is a modified stem or branch, typically consisting of a group of spines or thorns.

“The achenia on the cactus plant were a defense mechanism against predators.”

2. noun

In botany, a specific type of fruit, such as an achene, which is a small, dry fruit that has a single seed.

“The achenia on the plant were a key feature in its identification as a member of the Asteraceae family.”