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Pronunciation varies by accent · noun
(mineralogy) An orthorhombic-pyramidal mineral containing barium, hydrogen, oxygen, selenium, and uranium..
Use guilleminite when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Guilleminite means (mineralogy) An orthorhombic-pyramidal mineral containing barium, hydrogen, oxygen, selenium, and uranium..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use guilleminite where its definition matches the intended context.
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