PYRAMIDOID
Py*ram"i*doid, n. Etym: [Gr. -id: cf. F. pyramidoïde.]
Defn: A solid resembling a pyramid; — called also pyramoid. Barlow.
PYRAMIS
Pyr"a*mis, n.; pl. Pyramides. Etym: [L.]
Defn: A pyramid.
PYRAMOID
Pyr"a*moid, n.
Defn: See Pyramidoid.
PYRARGYRITE
Py*rar"gy*rite, n. Etym: [Gr. (Min.)
Defn: Ruby silver; dark red silver ore. It is a sulphide of antimony and silver, occurring in rhombohedral crystals or massive, and is of a dark red or black color with a metallic adamantine luster.
PYRAZINE; PYRAZIN
Pyr"a*zine, n. Also -zin. [Pyridine + Gr. not + life.] (Org. Chem.)
Defn: A feebly basic solid, C4H4N2, obtained by distilling piperazine with zinc dust, and in other ways. Also, by extension, any of various derivatives of the same.