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 DRC flora team(2025). Flora of the Democratic Republic of Congo: Glossary details: ob-. https://www.drcongoflora.com/speciesdata/glossary-display.php?glossary_id=469, retrieved 3 July 2025
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