1. Of or relating to invertebrates of the phylum Arthropoda
   - arthropodan, arthropodous

See also: arthropod, Arthropoda

• on-screen
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• on-street
• on-the-job
• on-the-scene
• onager
• Onagraceae
• onanism
• onanist
• once
• once again
• once and for all
• once in a blue moon
• once in a while
• once more
• once upon a time
• once-over
• onchocerciasis
• oncidium
• Oncidium papilio
• Oncidium papilio kramerianum
• oncogene
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• oncologist