äs

Etymology 1
Ultimately from. The initial vowel has changed over time. ä seems to have been original, but e dominated for some time during the early 20th century until it was again replaced by ä (although e did remain common in the late 20th century and is still used by some).

Noun

 * 1) ess

Etymology 2
Probably imitative.

Interjection

 * 1) argh expression of annoyance, anger or frustration