pinni-, pin- +

Having an uneven number of pinnae, by virtue of having one terminal pinna (a primary segment of the blade of a compound leaf).

In biology, having an even number of pinnae by virtue of having a pair in the terminal position.

A young feather; especially, one just emerging through the skin and which is still enclosed in a sheath.

1. A feather, wing, or fin.
2. Auricula, or outer ear; a bird's feather or wing; a fish fin.
3. Etymology: from Latin; akin to penna, "a feather, wing", or "fin".

1. Resembling a feather.
2. Divided in a feathery manner.
3. Of a compound leaf, having leaflets on each side of an axis or midrib.
4. Having similar parts arranged on each side of a common axis; that is, with lateral processes.

Leaves lobed halfway to midrib.

With leaves pinnately lobed.

Pinnate condition.

With leaves lobed three-quarters of the way to midrib.

Having lobed toes, as certain birds.

With leaves lobed almost to the base or midrib.

Pinnate with toothed lobes.

Feather-shaped or fin-shaped.

With veins disposed like parts of a feather.

1. Having feet resembling fins, fin-footed; specifically, belonging to a suborder (Pinnipedia) of Carnivora, comprising the seals and walruses, which have fin-like limbs or flippers; also, belonging to other divisions of animals having limbs or organs resembling fins and adapted for swimming, e.g. the fin-footed or lobe-footed birds, certain decapod crustaceans or crabs, the pteropod molluscs, etc.
2. A pinniped mammal; a seal or walrus.