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pinnate
This term is primarily used in botanical and zoological contexts to describe a specific geometric arrangement. It evokes the image of a feather, where smaller elements branch off a central stem or axis. In botany, it specifically refers to compound leaves where leaflets are paired along a rachis.
Because it is a technical descriptor, it is rarely encountered in casual conversation and is almost exclusively found in scientific descriptions, field guides, or academic texts. It is distinct from "palmate," where leaflets radiate from a single point like the fingers of a hand.
Meanings
Examples
Look at this fern frond and notice how the leaflets are pinnate.
The specimen exhibits a clearly pinnate venation pattern.
I wonder if this rare plant has a pinnate or palmate leaf structure.
The fish has a pinnate fin that helps it navigate through the current.
The professor explained that pinnate leaves are common in the legume family.
The delicate, pinnate foliage of the mimosa plant folds when touched.
This particular species of bird has a pinnate arrangement of vanes on its primary feathers.
This particular species of bird has a pinnate arrangement of vanes on its primary feathers.