In science, particularly biology or chemistry, something that is half of or partially related to a metope (a structural unit in architecture or a space between elements).
From demi- (half) and metope, a technical term used in specialized scientific contexts derived from Greek metope (space between).
This is such a technical, rarely-used term that even scientists have to think hard about what it means—it shows how specialized scientific language can create words that almost nobody needs.
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