PIPERONAL
Pip`er*o"nal, n. (Chem.)
Defn: A white crystalline substance obtained by oxidation of piperic acid, and regarded as a complex aldehyde.
PIPERYLENE
Pi*per"y*lene, n. Etym: [Piperidine + acetylene.] (Chem.)
Defn: A hydrocarbon obtained by decomposition of certain piperidine derivatives.
PIPESTEM
Pipe"stem`, n.
Defn: The hollow stem or tube of a pipe used for smoking tobacco,
etc.
Took a long reed for a pipestem. Longfellow.
PIPESTONE
Pipe"stone`, n.
Defn: A kind of clay slate, carved by the Indians into tobacco pipes.
Cf. Catlinite.
PIPETTE
Pi*pette", n. Etym: [F., dim. of pipe.]
Defn: A small glass tube, often with an enlargement or bulb in the middle, and usually graduated, — used for transferring or delivering measured quantities.