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PERIOCTAHE'DRAL, a. [Gr. octahedral.] Designating a crystal whose primitive form...
PERIM'ETER, n. [Gr. about, and measure.] In geometry, the bounds and limits of a...
PER'ILOUSNESS, n. Dangerousness; danger; hazard.
PER'ILOUSLY, adv. Dangerously; with hazard.
PER'ILOUS, a. Dangerous; hazardous; full of risk; as a perilous undertaking; a p...
PER'IL, n. [L. periculum, from Gr. to try, to attempt, that is, to strain; an at...
PERIHEXAHE'DRAL, a. [Gr.] Designating a crystal whose primitive form is a four s...
PERIHE'LION PERIHE'LIUM, n. [Gr. about, and the sun.] That part of the orbit of ...
PERIG'YNOUS, a. [Gr. about, and female.] In botany, inserted around the pistil, ...
PER'IGRAPH, n. [Gr. about, and a writing.] 1. A careless or inaccurate delineati...
PER'IGORD-STONE, n. An ore of manganese of a dark gray color, like basalt or tra...
PER'IGEE PERIGE'UM, n. [Gr. about, and the earth.] That point in the orbit of th...
PERIE'CIAN, n. [Gr.] An inhabitant of the opposite side of the globe,in the same...
PER'IDOT, n. Another name of the chrysolite. It may be known by its leek or oliv...
PERIDODECAHE'DRAL, a. [Gr.] Designating a crystal whose primitive form is a four...
PERIC'ULOUS, a. [L. periculosus. See Peril .] Dangerous; hazardous.