Definition of pinnate in English:

pinnate

Line breaks: pin|nate
Pronunciation: /ˈpɪneɪt
 
/

adjective

Botany
  • 1(Of a compound leaf) having leaflets arranged on either side of the stem, typically in pairs opposite each other.
    More example sentences
    • Immatures have a weakly developed taproot, and have pinnate compound leaves with two or three leaflets.
    • 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.
  • 1.1 Zoology (Especially of an invertebrate animal) having branches, tentacles, etc., on each side of an axis, like the vanes of a feather.
    More example sentences
    • 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.
    • Arrangement of septa in earliest stages pinnate in all quadrants.
    • The colonies are erect, typically delicate; reticulate (net-like) or pinnate (fern-like).

Derivatives

pinnated

adjective
More example sentences
  • There it was, that, year after year, and each successive season, I studied the habits of the Pinnated Grouse.
  • Pinnated Bittern (Botaurus pinnatus) is a species that is visually similar to the American Bittern (B. lentiginosus) which is more familiar to North American observers.

pinnately

adverb
More example sentences
  • The plant has 45 cm high clustered leafy stems with pinnately arranged pale green lance-shaped leaflets obliquely banded with pure white.
  • Each sporangial complex is born on a branch system that dichotomizes twice, with each resulting branch tip branching pinnately and ending in a sporangium.
  • Trichopitys lacks the short-shoot, long-shoot morphology and its ovules are born in pinnately branched systems that develop in the axils of leaves.

pinnation

Pronunciation: /-ˈneɪʃ(ə)n/
noun
More example sentences
  • Trabs rise steeply or sub-vertically from surface of pinnation, which is approximately 1/3-1/4 of wall thickness from gastral margin.
  • Anthaspidellid skeleton with surface of pinnation approximately at midwall, from which trabs rise upward and outward, or inward, to meet dermal and gastral surfaces at acute angles.
  • The angle of pinnation was found by placing a protractor along the central tendon and measuring the angle of an individual fiber to the nearest 0.5 deg.

Origin

early 18th century: from Latin pinnatus 'feathered', from pinna, penna (see pinna).

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