ausa (or auþa) is a Quenya word meaning "a dim shape, spectral or vague apparition".
 See also
- ↑ 1.0 1.1 J.R.R. Tolkien, "The Rivers and Beacon-hills of Gondor" (edited by Carl F. Hostetter), in Vinyar Tengwar, Number 42, July 2001, pp. 9-10