1. Thanatos - Noun
2. Thanatos - Proper noun
Thanatos
(Greek mythology) The god of death (specifically of a peaceful death), and twin brother of Hypnos (god of sleep); the Greek counterpart of Mors.
Thanatos (uncountable)
(psychoanalysis) The death drive in Freudian psychoanalysis.
As far as Zagreus knew, Meg and Thanatos were his sister and brother in a sense, as it's only after he discovers Persephone that he discovers that isn't the case. Source: Internet
Once the map is decrypted and the immediate threat of the Thanatos Guild is gone (temporarily), Nyssa realizes the map leads to other Lazarus Pits besides the one she destroyed in Nanda Parbat. Source: Internet
The first three parts of the sigil or symbol also resemble the word "Zos" as found in the magical philosophy of Crowley's associate Austin Osman Spare known as 'Zos vel Thanatos'. Source: Internet
Peter, "We Better Kill the Instinct to Kill Before It Kills Us or Violence, Mind Control, and Walker Percy's The Thanatos Syndrome". Source: Internet
This caused Ares to free Thanatos and turn Sisyphus over to him. Source: Internet
When Zeus ordered Thanatos to chain up Sisyphus in Tartarus, Sisyphus tricked Thanatos by asking him how the chains worked and ended up chaining Thanatos; as a result there was no more death. Source: Internet