(click for a larger image)
top: simple pinnate leaf
bottom: bipinnate leaf
pin·nate (pnt) KEY also pin·nat·ed (-td) KEY
- Resembling a feather; having parts or branches arranged on each side of a common axis: a polyp with a pinnate form; pinnate leaves.
Latin pinntus, feathered, from pinna, feather; see pet- in Indo-European roots