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osmium tetroxide
osmoconformer
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osmoregulator
osmose
osmosis
osmotic pressure
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osmunda

os·mun·da [ oz múndə ] (plural os·mun·das or os·mun·da)


noun 
Definition:
 
fern with large fronds: a fern with large spreading fronds, e.g. the royal fern. Genus Osmunda.

[13th century. < modern Latin Osmunda< Old French osmunde]
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