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Meanings of placoid in English

As the hard flattened scales of e.g. sharks.

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        Usage of placoid in English
        1
        A dense, white placoid infiltrate was present in the right macula extending into the vitreous.
        Pubmed
        2
        A dense, white placoid infiltrate was present in … Only a few cases involving Fusarium have been reported, most with unfavorable visual outcomes.
        Pubmed
        3
        Ganoids, Placoids, Cycloids and Ctenoids, based on the nature of the scales and other dermal appendages.
        The Project Gutenberg Encyclopedia, Volume 1 of 28
        4
        As the rays and sharks both belong to the order of placoids, it appears that the shark is not particular about preying on his kindred.
        Lippincott's Magazine of Popular Literature and Science, Volume ...
        Frequent collocations
        Placoid through the time