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[[image:fern_frond_pinnate.jpg|right|thumb|200px|A '''pinnate''' frond of the fern, ''Blechnum appendiculatum''.]]
'''Pinnate''' is a term used to describe [[feather]]-like or multi-divided features arising from both sides of a common axis in [[plant]] or [[animal]] structures, and comes from the [[Latin]] word ''pinna'' for "feather". A similar term is '''''pectinate''''', which refers to a [[comb]]-like arrangement of parts (arising from one side of an axis). The term contrasts somewhat with '''''[[leaf shape|palmate]]''''', in which the parts or structures radiate out from a common point.
Feather-like; with the [[leaflet]]s of a compound [[leaf]] placed on either side of the [[rachis]].{{SCH}}
Types:
'''pinnatifid''' – leaves with pinnate lobes that are not discrete, remaining sufficiently connected to each other that they are not separate leaflets.
'''pinnatifid'''
'''paripinnate''' – pinnately-compound leaves in which leaflets are born in pairs along the rachis without a single terminal leaflet; also called "even-pinnate".
'''paripinnate'''
'''imparipinnate''' – pinnately-compound leaves in which there is a lone terminal leaflet rather than a terminal pair of leaflets; also called "odd-pinnate".
'''imparipinnate'''
'''bipinnate''' – pinnately-compound leaves in which the leaflets are themselves pinnately-compound; also called "twice-pinnate".
'''bipinnate'''
'''tripinnate''' – pinnately-compound leaves in which the leaflets are themselves bipinnate; also called "thrice-pinnate".
'''tripinnate'''
'''tetrapinnate''' – pinnately-compound leaves in which the leaflets are themselves tripinnate.
'''tetrapinnate'''
{{glossary}}
