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[ noun ]
a farewell remark
<noun.communication>
they said their good-byes

Adios \A`dios"\, interj. [Sp., fr. L. ad to + deus god. Cf.
{Adieu}.]
Adieu; farewell; good-by; -- chiefly used among
Spanish-speaking people.
[Webster 1913 Suppl.]

Note: This word is often pronounced [*a]*d[=e]"[-o]s, but the
Spanish accent, though weak, is on the final syllable.
[Webster 1913 Suppl.]