Categories
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The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Organobromides (58 members)
- Organochloride insecticides (24 members)
- Organochlorides (206 members)
- Organofluorides (147 members)
- Organogadolinium compounds (1 member)
- Organohalides (37 members)
- Organoiodides (43 members)
- Organometallic chemistry (57 members)
- Organometallic compounds (58 members)
- Organonitrogen compounds (6 members)
- Organophosphate insecticides (31 members)
- Organophosphates (93 members)
- Organophosphinates (2 members)
- Organophosphine oxides (1 member)
- Organophosphines (2 members)
- Organophosphinites (1 member)
- Organophosphites (3 members)
- Organophosphonites (1 member)
- Organophosphorus (28 members)
- Organophosphorus compounds (1 member)
- Organoselenium compounds (1 member)
- Organosilanes (1 member)
- Organosilicon compounds (21 members)
- Organosulfates (15 members)
- Organosulfur compounds (46 members)
- Organs (26 members)
- Organs (anatomy) (1 member)
- Orgasm (14 members)
- Orgone Science and Technology (5 members)
- Orientation (6 members)
- Origin hypotheses of ethnic groups (1 member)
- Origin of life (16 members)
- Original Wikipedian userboxes (1 member)
- Orion arm (1 member)
- Oripavines (2 members)
- Orlando, Florida (5 members)
- Ormskirk (1 member)
- Ornamental plants (6 members)
- Ornamental trees (4 members)
- Ornaments (1 member)
- Ornithogalum (1 member)
- Ornithology (2 members)
- Orobanchaceae (1 member)
- Orphan drugs (16 members)
- Orphan initialisms (1 member)
- Orphaned articles (8 members)
- Orphaned articles from April 2007 (9 members)
- Orphaned articles from April 2014 (2 members)
- Orphaned articles from April 2016 (1 member)
- Orphaned articles from April 2017 (1 member)