a prefix meaning "opposite", "inverse" or "against". When used as a prefix before a word describing the shape of an organ, it means that the organ is attached to its stalk at the opposite end to the usual case.
The Burundi flora team(2025). Flora of Burundi: Glossary details: ob-. https://www.burundiflora.com/speciesdata/glossary-display.php?glossary_id=469, retrieved 16 June 2025
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