Having had calcium or mineral content removed; no longer calcified or hardened.
Past participle of 'decalcify,' used as an adjective to describe bones, tissues, or substances that have lost their calcium content through natural or artificial processes.
A decalcified bone becomes rubbery and weak—this is actually used in forensic science to help identify bones and study them under microscopes, because removing the hard mineral coating lets researchers see the details underneath!
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