| lobelia | (noun) any plant or flower of the genus Lobelia | - |
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| lobeliaceous | (adjective) belonging to the family Lobeliaceae | - |
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| nobelium | (noun) a radioactive transuranic element synthesized by bombarding curium with carbon ions; 7 isotopes are known | Synonyms: atomic number 102, No |
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| obelion | (noun) the craniometric point on the sagittal suture near the lamboid suture | - |
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| obelisk | (noun) a stone pillar having a rectangular cross section tapering towards a pyramidal top | - |
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| (noun) a character used in printing to indicate a second cross reference or footnote when the asterisk has already been used | Synonyms: dagger |