The Collaborative International Dictionary
Granitoid \Gran"i*toid\, a. [Granite + -oid: cf. F. granito["i]de.] Resembling granite in granular appearance; as, granitoid gneiss; a granitoid pavement.
Wiktionary
a. Resembling granite.
Wikipedia
A granitoid or granitic rock is a variety of coarse grained plutonic rock similar to granite which mineralogically is composed predominantly of feldspar and quartz. Examples of granitoid rocks include granite, quartz monzonite, quartz diorite, syenite, granodiorite and trondhjemite. Many are created by continental volcanic arc subduction or the collision of sialic masses. Volcanic rocks are common with granitoids and typically have the same origins. However, they are normally worn away after years of erosion.
While many granitoid rocks are located in areas that have experienced crustal thickening during orogenies, others known as anorogenic granitoids are unrelated to convergent boundaries or subduction zones. These anorogenic granitoids may represent the deep sources for rift volcanism exposed where erosion has removed the volcanic rocks and other evidence of rifting. These A-type granitoids may have been produced by hotspots or mantle plumes.
Usage examples of "granitoid".
The present lake wall of stone and granitoid was not then in place, but the road had been well laid out, the intermediate spaces of lawn were lovely to look upon, and the houses were thoroughly new and imposing.
He was standing on supracrustal rock bounded on both sides by granitoid gneisses: three point six billion years old.