23-letter words containing p, a, l, c, i, o
- topological equivalence — the property of two topological spaces such that there is a homeomorphism from one to the other.
- turn-and-slip indicator — bank-and-turn indicator.
- variable contrast paper — printing paper in which the contrast of the image is controlled by the color of the printing light.
- volumetric displacement — the volume of air per revolution that passes through a mechanical pump when the pressure at the intake and the exhaust is the same as that of the atmosphere
- weak accumulation point — accumulation point.
- wind cave national park — a national park in SW South Dakota. 41½ sq. mi. (107 sq. km).