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dal space is the space contained between a cycloid and its base. Cycloidal engine. See Geometric lathe.

fossils of the Paleozoic rocks. They were usually roundish or egg-shaped, and often unsymmetrical; some were sessile, others had short stems.

A prefix, from Gr. de`ka, signifying ten; specifically (Metric System), a prefix signifying the weight or measure that is ten times the principal unit.

A weight of the metric system; ten grams, equal to about 154.32 grains avoirdupois.

A measure of capacity in the metric system; a cubic volume of ten liters, equal to about 610.24 cubic inches, that is, 2.642 wine gallons.

A measure of length in the metric system; ten meters, equal to about 393.7 inches.

A weight in the metric system; one tenth of a gram, equal to 1.5432 grains avoirdupois.

A measure of capacity or volume in the metric system; one tenth of a liter, equal to 6.1022 cubic inches, or 3.38 fluid ounces.

A measure of length in the metric system; one tenth of a meter, equal to 3.937 inches.

t an acute angle; to cut or divide in the form of X; to intersect; -- said of lines in geometrical figures, rays of light, nerves, etc.

A solid bounded by twelve quadrilateral faces. It is a hemihedral form of the isometric system, allied to the tetrahedron.

Diagonal; diametrical; hence; diametrically opposed. [Obs.] Sin can have no tenure by law at all, but is rather an eternal outlaw, and in hostility with law past all atonement; both diagonal contraries, as much allowing one another as day and night together in one hemisphere. Milton.

Pertaining to a diameter; diametrical. Diametral curve, Diametral surface (Geom.), any line or surface which bisects a system of parallel chords drawn in a curve or surface. -- Diametral planes (Crystal.), planes in which two of the axes lie.

Diametrically.

A geometrical figure, consisting of four equal straight lines, and having two of the interior angles acute and two obtuse; a rhombus; a lozenge.

A unit employed by oculists in numbering glasses according to the metric system; a refractive power equal to that of a glass whose principal focal distance is one meter.

Of or pertaining to the dioptre, or to the metric system of numbering glasses. -- n.

The science of the refraction of light; that part of geometrical optics which treats of the laws of the refraction of light in passing from one medium into another, or through different mediums, as air, water, or glass, and esp. through different lenses; -- distinguished from catoptrics, which refers to reflected light…

Two metrical feet taken together, or included in one measure. Hadley. Trochaic, iambic, and anapestic verses . . . are measured by dipodies. W. W. Goodwin.

Not proportioned; unsymmetrical; unsuitable to something else in bulk, form, value, or extent; out of proportion; inadequate; as, in a perfect body none of the limbs are disproportionate; it is wisdom not to undertake a work disproportionate means. -- Dis`pro*por"tion*ate*ly, adv. -- Dis`pro*por"tion*ate*ness, n.…