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Having all the sides equal; as, an equilateral triangle; an equilateral polygon. Equilateral hyperbola (Geom.), one whose axes are equal. -- Equilateral shell (Zoöl.), one in which a transverse line drawn through the apex of the umbo bisects the valve, or divides it into two equal and symmetrical parts. -- Mutually e…

Having unequal sides; unsymmetrical; unequal-sided.

des or faces. Regular icosahedron, one of the five regular polyhedrons, bounded by twenty equilateral triangules. Five triangules meet to form each solid angle of the polyhedron.

he figure 8, with both parts symmetrical, generated by the point in which a tangent to an equilateral hyperbola meets the perpendicular on it drawn from the center.

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

A figure composed of two equilateral triangles intersecting so as to form a six-pointed star, -- used in early ornamental art, and also with superstitious import by the astrologers and mystics of the Middle Ages.

n, that is, the ratio of the height to the half span; as, a pitch of six rise to ten run. Equilateral pitch is where the two sloping sides with the span form an equilateral triangle. -- Pitch of a plane (Carp.), the slant of the cutting iron. -- Pitch pipe, a wind instrument used by choristers in regulating the pitch…

Same as Isometric. Regular polygon (Geom.), a plane polygon which is both equilateral and equiangular. -- Regular polyhedron (Geom.), a polyhedron whose faces are equal regular polygons. There are five regular polyhedrons, -- the tetrahedron, the hexahedron, or cube, the octahedron, the dodecahedron, and the icosahedr…

An equilateral parallelogram, or quadrilateral figure whose sides are equal and the opposite sides parallel. The angles may be unequal, two being obtuse and two acute, as in the cut, or the angles may be equal, in which case it is usually called a square.

Having a cross section in the form of an equilateral triangle; -- said especially of a kind of file.