Definitions

1. noun

In arthropods, a seta is a hair, bristle, or sensory seta that usually bears a sensory organ at the tip; in botany, a seta is a stalk or stalk-like part, especially of a sporophyte in ferns and other cryptogams.

“The arthropod’s setae helped it sense its environment.”

2. noun

In botany, a seta is a stalk that supports a capsule in a fern.

“The fern’s seta held the capsule high above the leaves.”