\I`so*met"ric\, Isometrical \I`so*met"ric*al\, a.
[Iso- + Gr. ? measure.]
1. Pertaining to, or characterized by, equality of measure.
2. (Crystallog.) Noting, or conforming to, that system of
   crystallization in which the three axes are of equal
   length and at right angles to each other; monometric;
   regular; cubic. Cf. {Crystallization}.
{Isometric lines} (Thermodynamics), lines representing in a
   diagram the relations of pressure and temperature in a
   gas, when the volume remains constant.
{Isometrical perspective}. See under {Perspective}.
{Isometrical projection}, a species of orthographic
   projection, in which but a single plane of projection is
   used. It is so named from the fact that the projections of
   three equal lines, parallel respectively to three
   rectangular axes, are equal to one another. This kind of
   projection is principally used in delineating buildings or
   machinery, in which the principal lines are parallel to
   three rectangular axes, and the principal planes are
   parallel to three rectangular planes passing through the
   three axes.