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ichthyodont
ichthyodont n.
Brit. 
/ˈɪkθɪə(ʊ)dɒnt/
, /ˈɪkθɪə(ʊ)dɒnt/U.S. /ˈɪkθiəˌdɑnt/
[Greek ὀδοντ- tooth] Palaeontology a fossil tooth of a fish./ˈɪkθiəˌdɑnt/ΘΚΠ
the world > animals > fish > parts of fish > [noun] > tooth or parts of tooth > fossil
shark-tooth1674
glossopetraa1684
ichthyodont1708
1708 Philos. Trans. (Royal Soc.) 26 78 Bufonites, The Toad-stone, or Capsular Ichthyodont.
1828 J. Stark Elements Nat. Hist. I. 492 Fossil teeth or ichthyodontes occur in great quantity in Malta and Sicily.
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