Twitter Google Share on Facebook plutonism Medical Encyclopedia Wikipedia Related to plutonism:volcanism plutonism (ˈpluːtɒnɪzəm) n (Geological Science)geologythe theory that the earth's crust was formed by volcanoes or the formation of plutons within the earth's crust ...
Also found in:Thesaurus,Encyclopedia,Wikipedia. Related to orthopyroxene:plagioclase,hornblende,Clinopyroxene or·tho·py·rox·ene (ôr′thə-pī-rŏk′sēn′) n. Any of a number of varieties of pyroxene that crystallize in the orthorhombic system and contain no calcium and little or no al...
RegisterLog in Sign up with one click: Facebook Twitter Google Share on Facebook petrology Thesaurus Encyclopedia Wikipedia Related to petrology:igneous petrology,sedimentary petrology pe·trol·o·gy (pə-trŏl′ə-jē) n. The branch of geology that deals with the origin, composition, struct...
the branch of geology that describes the past in terms of geologic rather than human time. —geochronologist,n. —geochronologic,geochronological,adj. See also:Earth the chronology of the earth as induced from geologic data. —geochronologist,n.—geochronologic, geochronological,adj. ...
1.Also,feld`spath•oi′dal.of or pertaining to a group of minerals similar in chemical composition to certain feldspars except for a lower silica content. n. 2.a mineral of this group, as nepheline or leucite. [1895–1900; < GermanFeldspat(h)(seefeldspar) +-oid] ...