Definition of alula in English:

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Pronunciation: /ˈalyələ/

noun (plural alulae /-yəˌlē/)

Technical term for bastard wing.
Example sentences
  • Although the alula is absent, the third finger probably had the same function in controlling separation of the upper surface airflow.
  • Yearlings in the study were identified in the hand by the olivegreen (rather than blue) edges of their alulae and primary coverts.
  • It has pure white body feathers except for the black alulae, primary techrices and primary remiges.


Late 18th century: modern Latin, literally 'small wing', diminutive of ala.

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