• 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
    • ***
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.
    • ***
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′
    • ***


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 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