| OSM | (physical chemistry) the pressure exerted by a solution necessary to prevent osmosis into that solution when it is separated from the pure solvent by a semipermeable membrane |
|---|---|
| OSM | by means of osmosis |
| OSM | any fern of the genus Osmunda: large ferns with creeping rhizomes |
| OSM | New World fern having woolly cinnamon-colored spore-bearing fronds in early spring later surrounded by green fronds |
| OSM | North American fern having tall erect pinnate fronds and a few sporogenous pinnae at or near the center of the fertile fronds |
| OSM | large deeply rooted fern of worldwide distribution with upright bipinnate compound tufted fronds |
| OSM | large family of ferns widely distributed in temperate and tropical areas |