‖Ra‐ti″tæ (rȧ‐tī″tē̍), n. pl. [NL., fr. L. ratis a raft; cf. L. ratitus marked with the figure of a raft.] (Zoöl.) 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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.