• WordNet 3.6
    • n trapezium the wrist bone on the thumb side of the hand that articulates with the 1st and 2nd metacarpals
    • n Trapezium a multiple star in the constellation of Orion
    • n trapezium a quadrilateral with no parallel sides
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Webster's Revised Unabridged Dictionary
    • Trapezium (Anat) A bone of the carpus at the base of the first metacarpal, or thumb.
    • Trapezium (Geom) A plane figure bounded by four right lines, of which no two are parallel.
    • Trapezium (Anat) A region on the ventral side of the brain, either just back of the pons Varolii, or, as in man, covered by the posterior extension of its transverse fibers.
    • ***
Century Dictionary and Cyclopedia
    • n trapezium In geometry: Any quadrilateral not a parallelogram. A trapezoid.
    • n trapezium An irregular quadrangle in the nebula of Orion, formed by its four brightest stars.
    • n trapezium In geometry, a plane figure contained by four straight lines of which no two are parallel.
    • n trapezium In anatomy:
    • n trapezium A cross-band of fibers near the lower border of the pons Varolii, passing from the region of the accessory auditory nucleus to the raphe. They may come, in part, down from the cerebellum or up from the restiform body, as well as from the region mentioned, and seem to terminate in the superior olive of the same side, or in the superior olive, the lemniscus, and accessory auditory nucleus of the opposite side. A group of large-sized ganglion-cells among the fibers is called the nucleus trapezii. Also called corpus trapezoides.
    • n trapezium The bone on the radial side of the distal row of carpal bones, articulating with the metacarpal bone of the thumb; carpale I. of the typical carpus, whatever its actual shape. Also called multangulum majus. See cuts under Perissodactyla, scapholunar, and hand.
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Chambers's Twentieth Century Dictionary
    • n Trapezium tra-pē′zi-um a plane figure having four unequal sides, no two of which are parallel: one of the wrist-bones—also Trapēze′
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Webster's Revised Unabridged Dictionary
NL., fr. Gr. a little table, an irregular four-sided figure, dim. of a table, for ; (see Tetra-) + foot, akin to foot; hence, originally, a table with four feet. See Foot
Chambers's Twentieth Century Dictionary
Gr. trapezion dim. of trapeza, a table; from tetra, four, pous, podos, a foot.


In literature:

These four streets surrounded this trapezium like a moat.
"Les Misérables Complete in Five Volumes" by Victor Hugo
There was a curious thirteenth-century chest, trapezium in form, and said to be the only one of that shape in the West of England.
"From John O'Groats to Land's End" by Robert Naylor and John Naylor
A three-inch telescope resolves th Orionis into the famous trapezium, and a nine-inch instrument sees two stars more.
"Recreations in Astronomy" by Henry Warren
It towered over everything, and was shaped like a trapezium.
"Across Unknown South America" by Arnold Henry Savage Landor
Trapeziform: in the form or shape of a trapezium.
"Explanation of Terms Used in Entomology" by John. B. Smith
These four stars are collectively named the Trapezium.
"Pleasures of the telescope" by Garrett Serviss
We will debate as to whether this equality of parts exists in all parallelograms, trapeziums, and like figures.
"Émile" by Jean Jacques Rousseau
T, T, The trapezium and trapezoid bones.
"A Treatise on Anatomy, Physiology, and Hygiene (Revised Edition)" by Calvin Cutter
In shape, the peninsula forms a rough trapezium, with its greatest length from north-west to south-east.
"Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3" by Various
The trapezium is wanting in the latter.
"Artistic Anatomy of Animals" by Édouard Cuyer
In many Ungulates the trapezium vanishes.
"The Cambridge Natural History, Vol X., Mammalia" by Frank Evers Beddard

In science:

Figure 1: Contours of 880 µm continuum emission toward the proplyds in the Trapezium Cluster.
The Masses of the Orion Proplyds from Submillimeter Dust Emission
The position of the four Trapezium O stars are shown by the large star symbols and the center of the coordinate grid has been set to θ1 Ori C.
The Masses of the Orion Proplyds from Submillimeter Dust Emission
The only exception is the least massive of the Trapezium stars, Θ1 Ori B (see Fig. 2), whose components (each a binary system) have a dynamical mass of Mp=6.3 M⊙ and Ms=2.5 M⊙ , respectively.
Stellar evolution before the ZAMS
In one possible scenario, component B lies closer to the trapezium stars, and has an associated H II region that absorbs the momentum of the stellar UV radiation.
Conference Summary: The Cosmic Agitator - Magnetic Fields in the Galaxy
It shows the inner part of the Orion Trapezium θ Ori cluster.
Design of the wavefront sensor unit of ARGOS, the LBT laser guide star system
To achieve as good agreement with the asymptotic solutions as obtained using the Gaussian scheme of §3.2, the trapezium method requires at least 2 orders of magnitude more grid points.
Radiation driven winds from luminous accretion disks
For example, in the Orion Trapezium Cluster at least one of the Trapezium members is itself a Trapezium-like subsystem, and the other members (except θ Ori 1D) are binary or triple systems (see, e.g.
Modest-2: A Summary
Focusing on the Trapezium cluster this issue has been discussed by Scally & Clarke (2002). • Stars typically form as parts of a binary or higher-order multiple system.
Modest-2: A Summary
Chandra’s HRC observations analysed by Flaccomio et al. (2003) covered a 30′ × 30′ field of view, and were centered on the Trapezium cluster.
Evolution of X-ray emission from young massive star clusters
The density of the Trapezium, ≈ 5 × 103 stars pc−3 within the central 0.1 pc, makes it one of the most dense clusterings known in our Galaxy.
Evolution of X-ray emission from young massive star clusters
Hence it would be impossible to resolve the low- and solar-mass stellar population, while the X-ray bright stars of Trapezium would appear as one point source embeded in diffuse emission.
Evolution of X-ray emission from young massive star clusters
The union of these four pieces looks like a trapezium (see below, where we have omitted subscripts for convenience).
Cannon-Thurston Maps for Kleinian Groups
It is highly variable in optical depth, this being the greatest in the highly obscured Dark Bay feature lying immediately to the east of the Trapezium stars.
Spectrophotometry of the Huygens Region of the Orion Nebula, the Extended Orion Nebula, and M~43; Scattered Light Systematically Distorts Conditions Derived from Emission-Lines
The arc-like component D Component D was first identified by vdWG90 and is the largest of the small-scale components, extending over a significant part of the Huygens region between the Trapezium stars and the Bright Bar.
Tearing the Veil: interaction of the Orion Nebula with its neutral environment
As a result, the gas behind this dense post-shock region is shielded from the ionizing radition of the Trapezium stars, and rapidly recombines and cools.
Tearing the Veil: interaction of the Orion Nebula with its neutral environment