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 Rwanda flora team(2025). Flora of Rwanda: Glossary details: ob-. https://www.rwandaflora.com/speciesdata/glossary-display.php?glossary_id=469, retrieved 14 June 2025
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