allotriomorphic

adjective

al·​lot·​ri·​o·​mor·​phic

ə¦lä‧trēə¦mȯrfik

: marked by a form different from the normal or expected because of development in special circumstances

—used especially of mineral grains of igneous rocks whose mutual growths have prevented the assumption of outward crystal form

—contrasted with idiomorphic

Word History

Etymology

Greek allotrio- + English -morphic

First Known Use

1887, in the meaning defined above

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