One of the mysteries of the English language finally explained.
1(of a compound leaf) having leaflets arranged on either side of the stem, typically in pairs opposite each other.
- ‘In 1794, Moench named A. tuberosa and described it as having tuberous roots, unevenly pinnate leaflets, and purple flowers in lateral racemes.’
- ‘Green stems are interconnected by sensitive petioles and bear pinnate leaves.’
- ‘It has pinnate leaves and racemes of lilac pink flowers, which are slightly fragrant.’
- ‘Immatures have a weakly developed taproot, and have pinnate compound leaves with two or three leaflets.’
- ‘All of these foliage forms are planate pinnate fronds, frequently with open venation.’
- 1.1Zoology (especially of an invertebrate animal) having branches, tentacles, etc., on each side of an axis, like the vanes of a feather.
- ‘The colonies are erect, typically delicate; reticulate (net-like) or pinnate (fern-like).’
- ‘Arrangement of septa in earliest stages pinnate in all quadrants.’
- ‘The microsporophyll of Lepidopteris has been reconstructed as a pinnate axis with short branches bearing clusters of small elongate pollen sacs fused at the base.’
Early 18th century: from Latin pinnatus ‘feathered’, from pinna, penna (see pinna).
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