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Amphoteric

Amphoteric describes something made of two components, or acting like two different components.

In chemistry, it means a substance that can act as either acid or base. An example is amino acids and water. See also amphiprotic.

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... 210s 220s 230s - 240s - 250s 260s 270s 280s 290s Years: 237 238 239 240 241 - 242 - 243 244 245 246 247 Events Patriarch Titus[?] succeeds Patriarch Eugenius I[?] as ...