Trapezium


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trapezium

1. Chiefly Brit a quadrilateral having two parallel sides of unequal length
2. Now chiefly US and Canadian a quadrilateral having neither pair of sides parallel
3. a small bone of the wrist near the base of the thumb

Trapezium

(tră-pee -zee-ŭm) A very young open cluster of stars, protostars, gas, and dust that lies in the Orion nebula and is part of the Orion association. There are four prominent young main-sequence stars, which form the multiple star θ1 Orionis and are of spectral class O6, B1, B1, and B3. These stars excite and ionize the nebula. They form a trapezium and are visible with a small telescope.

Trapezium

 

the multiple star θ1 Orionis, located in the middle part of the Great Nebula of Orion. The star has nine known components, the four brightest of which (A, B, C, and D in Figure 1) form the vertices of a trapezium.

Figure 1. The Trapezium; the arrows at six of the stars indicate their proper motions over 1,000 years and the tangential velocity components on the scale indicated in the figure

In 1949, V. A. Ambartsumian discovered a number of similar stellar systems, in which the distances between components are of the same order of magnitude. Such systems came to be called Trapezium-type multiple stars. The periodic orbital motions observed in ordinary multiple stars are unlikely in Trapezium systems; consequently, such systems should be regarded as unstable and in the process of breaking up. According to Ambartsumian’s determinations, Trapezium systems break up in a few million years. It follows that such systems observed at the present time cannot be older than a few million years and are therefore young formations. A considerable number of Trapezium-type multiple stars are found in stellar associations.

trapezium

[trə′pē·zē·əm]
(mathematics)
A quadrilateral where no sides are parallel.

Trapezium

[trə′pē·zē·əm]
(astronomy)
Four very hot stars that appear to the eye as a single star in the Great Nebula of Orion; the star symbol is M42.
References in periodicals archive ?
(11) He reported on 12 thumbs and described careful dissection and excision of the trapezium, followed by taking a split portion of the flexor carpi radialis (FCR) tendon and using it as a graft by rolling it into a ball, or "anchovy," and placing it into the void created by trapezial excision.
Experimenting with DGS it is not too difficult to find that d seems to be 0 for points I on the midsegment m of the trapezium (Figure 4).
When there was alternate bilateral chewing, it was identified, for all studied muscles, tendency to symmetry of postural muscular electrical activation, however, without statistical significance (p=0.60 for the muscular electrical potential of the sternocleidomastoid and alternate bilateral chewing; p=0.54 for the muscular electrical potential of the trapezium and alternate bilateral chewing; p=0.50 for the muscular electrical potential of the gluteous medius and alternate bilateral chewing and p=0.067 for the muscular electrical potential of the anterior tibial and alternate bilateral chewing) (Illustration 3).
The Taj Trapezium Zone, set up in 1996, is a defined area of 10,400 square kilometers around the UNESCO World Heritage site to protect it from pollution.
Another visual activity can be based on a tangram where the possibility of using two, three, four and all pieces to make a triangle, a square, a parallelogram, a rectangle that is not a square and a trapezium can be investigated (Figure 4).
The plain radiograph revealed a trapezium body fracture and dorsal dislocation of the CMC joint (Figures 3(a) and 3(b)).
Both the trapezium fracture treated had excellent functional outcome.
The capsule was then subperiosteally elevated off the trapezium and the trapezium was removed.
Right in its midst is the quadruple star Theta1 (01) Orionis, also called the Trapezium, which illuminates the area.
A Anun B A horse C A knight in armour D A falconer QUESTION 9 - for 9 points: How many sides does a trapezium have?
The testers come standard with the firm's Trapezium X or Trapezium Lite X software to gather and display data for users in real time.
For example, Statement 2 states that "The diagonals of an isosceles trapezium are equal." (Note, in the actual professional development in North Carolina, USA, the term trapezoid rather than trapezium was used).