noun
Geological term for a fragment of older rock enclosed within a larger igneous rock body.
花崗岩の中に包有物が見つかった。
Inclusions were found inside the granite.
Compound of 包有 (ほうゆう, 'enveloping, containing') + 物 (ぶつ, 'thing'). The exact derivation is uncertain; the spelling is conventionally associated with the geological meaning.