Spurious /(spū"rĭ*ŭs)/

Spu·ri·ous

Spurious

a.
  1. Not proceeding from the true source, or from the source pretended; not genuine; counterfeit; false; adulterate.
  2. Not legitimate; bastard; as, spurious issue.

Phrases & Compounds
Spurious primary
the first, or outer, primary quill when rudimentary or much reduced in size, as in certain singing birds.
Spurious wing
the bastard wing, or alula.