Etymology
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Niobe 

in Greek mythology, a queen of Thebes, daughter of Tantalus, married to Amphion, she was changed to a stone while weeping for her numerous children (slain, after she boasted of them overmuch, by Artemis and Apollo); hence the name is used figuratively for bereavement and woe. The name is said to mean literally "snowy; snowy-bright." By scientists the name was given to a type of trilobites and an asteroid. Related: Niobean.

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Acheron 

1580s, fabled river of the Lower World in Greek mythology, from Greek Akheron, the name of several real rivers in addition to being the mythical river of the Underworld. The name perhaps means "forming lakes" (compare Greek akherousai "marsh-like water"), from PIE root *eghero- "lake" (source of Lithuanian ežeras, ažeras, Old Prussian assaran, Old Church Slavonic jezero "lake").

The derivation from Greek akhos "woe" is considered folk etymology. The name later was given to certain rivers in Greece and Italy because they flowed through dismal surroundings or disappeared underground and were thought to be gateways to the Underworld. Related: Acherontic.

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