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| the present age, following the bronze age; the last and worst of the four ages of the human race, characterized by danger, corruption, and toil |
| of or pertaining to the deities, spirits, and other beings dwelling under the earth |
| Hero (hē'rō) Pronunciation Key
Greek mathematician who wrote on mechanics and invented many water-driven and steam-driven machines. He also developed a formula for determining the area of a triangle. |
hero (of the underworld) definition
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submarine definition
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