Pertaining to diatoms or their fossil remains.
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di·a·to·ma·ceous .dī-ət-ə-'mā-shəs, (.)dī-.at- adj consisting of or abounding in diatoms or their siliceous remains
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di·a·to·ma·ceous (di″ə-to-maґshəs) composed of diatoms; see infusorial earth, under earth.Medical dictionary. 2011.