noun
- plural of pinnation; the arrangement or condition of being pinnate (having parts arranged like the vanes of a feather on either side of a central axis)
Usage: technical; botany; zoology
Examples
- The pinnations of the fern leaves create a delicate, feathery appearance.
- Botanists study the pinnations of compound leaves to classify plant species.
- The insect's antennae displayed intricate pinnations along their length.
- Different types of pinnations help distinguish between various fern species.