Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Combined with five molecules of water

from The Century Dictionary and Cyclopedia

  • Containing live molecules of water in combination, as crystallized cupric sulphate or common blue vitriol, CuSO4.5H2O.

Etymologies

From penta- +‎ hydrated (Wiktionary)

Examples

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