PORTIONLESS
Por"tion*less, a.
Defn: Having no portion.
PORTISE
Por"tise, n.
Defn: See Portass. [Obs.]
PORTLAND CEMENT
Port"land ce*ment".
Defn: A cement having the color of the Portland stone of England, made by calcining an artificial mixture of carbonate of lime and clay, or sometimes certain natural limestones or chalky clays. It contains a large proportion of clay, and hardens under water.
PORTLAND STONE
Port"land stone".
Defn: A yellowish-white calcareous freestone from the Isle of
Portland in England, much used in building.
PORTLAND VASE
Port"land vase`.
Defn: A celebrated cinerary urn or vase found in the tomb of the Emperor Alexander Severus. It is owned by the Duke of Portland, and kept in the British Museum.