ˈt(h)ōlēˌīt noun
( -s )
Etymology: Tholei, Tholey , village in Saarland, Germany + International Scientific Vocabulary -ite (I); originally formed as German tholeiit
: a basaltic rock that is rich in aluminum and low in potassium, is found typically in the ocean floor, and is prob. derived from the earth's mantle
• tho·lei·it·ic ¦t(h)ōlē¦id.ik adjective