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Harden

From Biology-Online Dictionary
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Harden

1. To make hard or harder; to make firm or compact; to indurate; as, to harden clay or iron.

2. To accustom by labour or suffering to endure with constancy; to strengthen; to stiffen; to inure; also, to confirm in wickedness or shame; to make unimpressionable. Harden not your heart. I would harden myself in sorrow. (job vi. 10)

Origin: oe. Hardnen, hardenen.