Helas is defined as alas, which is used to show sorrow or concern.
An example of helas is, "Alas, I think we have lost the money."
See hélas in Webster's New World College Dictionary
interjection
Browse entries near hélas
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Hälsingborg
H-back
H-bomb
Héloïse
H-hour
Hölderlin
hôtel de ville
H. Rept.