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perianth
periapsis
periapt
periastron
pericarditis
pericardium
pericarp
perichondrium
periclase
periclinal
pericline
pericope
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periclase
per·i·clase [ pérrə klàyss, pérrə klàyz ]


noun 
Definition:
 
mineral containing magnesium: a colorless, gray, green, or yellow magnesium oxide mineral. Source: limestone.
[Mid-19th century. Directly or via German Periklas< modern Latin periclasia< Greek peri "around" + klasis "breaking"; from its perfect cleavage]

per·i·clas·tic [ pèrrə klástik ] adjective
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