| 释义 |
Definition of pinnate in English: pinnateadjective ˈpɪneɪt Botany 1(of a compound leaf) having leaflets arranged on either side of the stem, typically in pairs opposite each other. 〔植〕（复叶）羽状的 Example sentencesExamples - Green stems are interconnected by sensitive petioles and bear pinnate leaves.
- 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.
- It has pinnate leaves and racemes of lilac pink flowers, which are slightly fragrant.
- 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.
〔动〕（尤指无脊椎动物）羽状的 Example sentencesExamples - 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).
Derivativesadjective 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. Example sentencesExamples - There it was, that, year after year, and each successive season, I studied the habits of the Pinnated Grouse.
adverb Each sporangial complex is born on a branch system that dichotomizes twice, with each resulting branch tip branching pinnately and ending in a sporangium. Example sentencesExamples - The discs are in their turn pinnately arranged around an axis.
- The plant has 45 cm high clustered leafy stems with pinnately arranged pale green lance-shaped leaflets obliquely banded with pure white.
- Trichopitys lacks the short-shoot, long-shoot morphology and its ovules are born in pinnately branched systems that develop in the axils of leaves.
noun pɪˈneɪʃ(ə)n 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. Example sentencesExamples - Trabs rise steeply or essentially normally to upper surface from ill-defined surface of pinnation that appears to be near gastral margin.
- For example, the angle of pinnation of a pinnate muscle may affect the force of contraction.
- 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.
- Trabs rise steeply or sub-vertically from surface of pinnation, which is approximately 1/3-1/4 of wall thickness from gastral margin.
OriginEarly 18th century: from Latin pinnatus 'feathered', from pinna, penna (see pinna). Definition of pinnate in US English: pinnateadjective Botany 1(of a compound leaf) having leaflets arranged on either side of the stem, typically in pairs opposite each other. 〔植〕（复叶）羽状的 Example sentencesExamples - Immatures have a weakly developed taproot, and have pinnate compound leaves with two or three leaflets.
- It has pinnate leaves and racemes of lilac pink flowers, which are slightly fragrant.
- In 1794, Moench named A. tuberosa and described it as having tuberous roots, unevenly pinnate leaflets, and purple flowers in lateral racemes.
- All of these foliage forms are planate pinnate fronds, frequently with open venation.
- Green stems are interconnected by sensitive petioles and bear pinnate leaves.
- 1.1Zoology (especially of an invertebrate animal) having branches, tentacles, etc., on each side of an axis, like the vanes of a feather.
〔动〕（尤指无脊椎动物）羽状的 Example sentencesExamples - 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).
OriginEarly 18th century: from Latin pinnatus ‘feathered’, from pinna, penna (see pinna). |