Definition of "pyramis"

And from hence also shall be the geodesy of the Icosaedrum. For the finding out of the heighth of the pyramis, there is the semidiagony of the side of the decangle and the halfe ray of the circle: But the side of the decangle is a right line subtending the halfe periphery of the side of the quinquangle, or else the greater segment of the ray proportionally cut.

1636, Peter Ramus, translated by Peter Bedwell, The Way To Geometry: [Being Necessary and Usefull for Astronomers, Enginees, Geographers,. Architects, Land-meaters, Carpenters, Sea-men & Etc.]‎, pages 277–278

For as a Pyramis, beginning at a point, by little and little dilateth into all parts […]

1838, Alexander Crawford Lindsay Crawford, Letters on Egypt, Edom, and the Holy Land‎, volume 1, page 95