| osmiridium | (noun) a hard and corrosion resistant mineral that is a natural alloy of osmium and iridium (usually containing small amounts of rhodium and platinum); used in needles and pen nibs etc. | Synonyms: iridosmine |
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| osmium | (noun) a hard brittle blue-grey or blue-black metallic element that is one of the platinum metals; the heaviest metal known | Synonyms: atomic number 76, Os |
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| osmoreceptor | (noun) sensory end organ that responds to changes in osmotic pressure | - |
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| osmosis | (noun) (biology, chemistry) diffusion of molecules through a semipermeable membrane from a place of higher concentration to a place of lower concentration until the concentration on both sides is equal | - |
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| osmotic | (adjective) of or relating to osmosis | - |
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| osmotically | (adverb) by means of osmosis | - |
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| osmund | (noun) any fern of the genus Osmunda: large ferns with creeping rhizomes; naked sporangia are on modified fronds that resemble flower clusters | Synonyms: flowering fern |
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