1. A Chadic language spoken in Chad

Type of: East Chadic

• 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
• oncologic
• oncological
• oncologist
• oncology
• oncoming
• Oncorhynchus
• Oncorhynchus keta
• Oncorhynchus kisutch
• Oncorhynchus nerka
• Oncorhynchus tshawytscha
• oncost
• Oncovin
• Ondaatje
• Ondatra