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Having oblique angles; as, an oblique-angled triangle.

Not pointed or acute; blunt; -- applied esp. to angles greater than a right angle, or containing more than ninety degrees.

A plane figure of eight sides and eight angles.

Having eight sides and eight angles.

bounded by eight faces. The regular octahedron is contained by eight equal equilateral triangles.

Having eight angles; eight-angled. -- Oc*tan"gu*lar*ness, n.

An instrument for measuring angles (generally called a quadrant), having an arc which measures up to 9Oº, but being itself the eighth part of a circle. Cf. Sextant.

A short distance measured at right angles from a line actually run to some point in an irregular boundary, or to some object.

rystal has two. -- Optical circle (Opt.), a graduated circle used for the measurement of angles in optical experiments. -- Optical square, a surveyor's instrument with reflectors for laying off right angles.

A life blissful and ordinate." Chaucer. Ordinate figure (Math.), a figure whose sides and angles are equal; a regular figure.

That point in which the three perpendiculars let fall from the angles of a triangle upon the opposite sides, or the sides produced, mutually intersect.

potash feldspar crystallizing in the monoclinic system and having two cleavages at right angles to each other. See Feldspar.

Breaking in directions at right angles to each other; -- said of the monoclinic feldspars.

The diagonal or lateral axis in a monoclinic crystal which is at right angles with the vertical axis.

Perpendicularly; at right angles; as, a curve cuts a set of curves orthogonally.

Of or pertaining to right lines or angles. Orthographic or Orthogonal, projection, that projection which is made by drawing lines, from every point to be projected, perpendicular to the plane of projection. Such a projection of the sphere represents its circles as seen in perspective by an eye supposed to be placed at…

Having the axes at right angles to one another; -- said of crystals or crystalline forms.

Having the right form. Orthomorphic projection, a projection in which the angles in the figure to be projected are equal to the corresponding angles in the projected figure.

Noting the system of crystallization which has three unequal axes at right angles to each other; trimetric. See Crystallization.

Cutting at right angles. Orthotomic circle (Geom.), that circle which cuts three given circles at right angles.