- 1. n. pl. An order of birds in which the wings are small, rudimentary, or absent, and the breastbone is destitute of a keel. The ostrich, emu, moa, and apteryx are examples. Source: opted
- 2. An order of birds in which the wings are small, rudimentary, or absent, and the breastbone is destitute of a keel. The ostrich, emu, and apteryx are examples. Source: webster
- 3. An order of birds in which the wings are small, rudimentary, orabsent, and the breastbone is destitute of a keel. The ostrich, emu,and apteryx are examples. Source: adambom
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