ostracoderm
(obsolete) A hyacinth.
Not renounceable.
One who studies glaciers.
(zoology) Any of the armored jawless fishes of the Paleozoic.
博物館は、古生代に生息した装甲を持つ無顎類の復元化石を展示し、その頑丈な頭盾で来館者を驚かせた。
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