| 释义 |
Definition of trochoid in English: trochoidadjective ˈtrəʊkɔɪdˈtroʊkɔɪd 1Anatomy
Denoting a joint in which one element rotates on its own axis (e.g. the atlas vertebra). 〔剖〕（关节）车轴状的，滑车状的 Example sentencesExamples - The trochoid joint is composed of a ball shape that is surrounded by a circle composed of bone and ligaments.
- It was in fact a spiral trochoid joint with a cuneiform convexity in all the simian primates except for the humans.
- The third, a median joint formed by the dens of the axis and the fovea dentis of the atlas, is classified as a trochoid joint and permits rotation.
2Geometry
Denoting a curve traced by a point on a radius of a circle rotating along a straight line or another circle (a cycloid, epicycloid, or hypocycloid). 〔几何〕（次）摆线的 Example sentencesExamples - The trochoid form that is attributed to ocean waves changes shape as the amplitude increases for a given wavelength.
- A trochoid curve is created by tracing the path of a point that is a distance b from the centre of the circle.
- A trochoid curve is very similar to a cycloid curve.
3Zoology
Having or denoting a form of mollusc shell which is conical with a flat base, like a top shell. 〔动〕（螺壳）圆锥形的 Example sentencesExamples - Thus, calice size may have been a factor (as discussed below), along with having a larger area for distribution of weight, which may account for the abundance of trochoid and patellate shapes in H. halli living on and in soft mud.
- The second corallum is a much larger, rounded trochoid form that approaches 11 cm in length and reached a maximum diameter of 4.7 cm.
- The shell of Microdoma conicum bears an inner nacreous layer and their shell layers resemble those of modern trochoids.
noun ˈtrəʊkɔɪdˈtroʊkɔɪd 1A trochoid curve. （次）摆线 Example sentencesExamples - Not only does the new one squeeze out the juice, it does so smoothly and quietly due to the nature of its two spinning, triangular trochoids, rather than the action of pumping pistons.
- A trochoid refers to any of the cycloid, the curtate cycloid and the prolate cycloid.
- It will be observed that when k=0, the hypertrochoid degenerates into a curtate hypotrochoid, but this degeneration keeps the curve in the set of hypertrochoids that contains the subset of trochoids.
2A trochoid joint. （次）摆线 Example sentencesExamples - However, neontological evidence suggests that fissurelloids diverged from other vetigastropods relatively recently (e.g., after the divergence of trochoids, which likely was in the late Paleozoic).
Derivativesadjective trəʊˈkɔɪd(ə)l In recent years, machining strategies such as trochoidal and morph cutting have been introduced in attempts to mitigate the negative impact of tool overload. Example sentencesExamples - The engine housing 38 has an internal trochoidal surface TS typically found in rotary type engines.
- The notion ‘bearing reducers’ indicates the full integration of a high precision trochoidal reduction gear and a radial-axial bearing in a single unit.
- The siltstones are intensely rippled, with bedding planes showing original bedforms with straight crests, and symmetrical and trochoidal cross-sectional geometries; features typical of wave generated ripples.
- This automatically avoids high-load cuts that could occur with conventional offset strategies, by switching to a trochoidal motion when the cutter encounters large amounts of material.
OriginEarly 18th century: from Greek trokhoeidēs 'wheel-like', from trokhos 'wheel'. Definition of trochoid in US English: trochoidadjectiveˈtrōkoidˈtroʊkɔɪd 1Anatomy
Denoting a joint in which one element rotates on its own axis (e.g. the atlas vertebra). 〔剖〕（关节）车轴状的，滑车状的 Example sentencesExamples - The third, a median joint formed by the dens of the axis and the fovea dentis of the atlas, is classified as a trochoid joint and permits rotation.
- It was in fact a spiral trochoid joint with a cuneiform convexity in all the simian primates except for the humans.
- The trochoid joint is composed of a ball shape that is surrounded by a circle composed of bone and ligaments.
2Geometry
Denoting a curve traced by a point on a radius of a circle rotating along a straight line or another circle (a cycloid, epicycloid, or hypocycloid). 〔几何〕（次）摆线的 Example sentencesExamples - A trochoid curve is created by tracing the path of a point that is a distance b from the centre of the circle.
- A trochoid curve is very similar to a cycloid curve.
- The trochoid form that is attributed to ocean waves changes shape as the amplitude increases for a given wavelength.
3Zoology
Having or denoting a form of mollusk shell which is conical with a flat base, like a top shell. 〔动〕（螺壳）圆锥形的 Example sentencesExamples - The second corallum is a much larger, rounded trochoid form that approaches 11 cm in length and reached a maximum diameter of 4.7 cm.
- The shell of Microdoma conicum bears an inner nacreous layer and their shell layers resemble those of modern trochoids.
- Thus, calice size may have been a factor (as discussed below), along with having a larger area for distribution of weight, which may account for the abundance of trochoid and patellate shapes in H. halli living on and in soft mud.
nounˈtrōkoidˈtroʊkɔɪd 1A trochoid curve. （次）摆线 Example sentencesExamples - It will be observed that when k=0, the hypertrochoid degenerates into a curtate hypotrochoid, but this degeneration keeps the curve in the set of hypertrochoids that contains the subset of trochoids.
- Not only does the new one squeeze out the juice, it does so smoothly and quietly due to the nature of its two spinning, triangular trochoids, rather than the action of pumping pistons.
- A trochoid refers to any of the cycloid, the curtate cycloid and the prolate cycloid.
2A trochoid joint. （次）摆线 Example sentencesExamples - However, neontological evidence suggests that fissurelloids diverged from other vetigastropods relatively recently (e.g., after the divergence of trochoids, which likely was in the late Paleozoic).
OriginEarly 18th century: from Greek trokhoeidēs ‘wheel-like’, from trokhos ‘wheel’. |