cryptobioticPronunciation: /ˈkrɪptəʊbʌɪˈɒtɪk/Definition of cryptobiotic adjective Biology 1relating to or capable of cryptobiosis. 2denoting primitive organisms of the kind presumed to have existed in earlier geological periods but to have left no trace of their existence. cryptobiotic in other Oxford dictionaries Definition of cryptobiotic in the US English dictionary