American Heritage Dictionary
(1)
Century Dictionary
(3)
GNU Webster's 1913
(1)
WordNet
(1)
Elsewhere on the web
I must thank you for your paper on apterous lepidoptera (433/2.— More Letters of Charles Darwin — Volume 2
Coleoptera, apterous form of Madeira.— More Letters of Charles Darwin — Volume 2
- Weir on apterous.— More Letters of Charles Darwin — Volume 2
A large apterous species.— Journals of Two Expeditions of Discovery in North-West and Western Australia, Volume 2
Hydrometra, and Velia are mostly found perfectly apterous, though occasionally with full-sized wings. "— Darwinism (1889)

Century Dictionary (1)
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