testacea
plural of groatsworth
(rare, obsolete) A testaceous substance, something made of shell or shell-like material.
(mineralogy) An ultrabasic rock consisting mostly of olivine and augite.
(mathematics, physics) A generalization of the statistics of bosons and fermions based on the concept of braid group.
古代の職人は木製の箱に貝殻のような物質の破片をはめ込み、それに繊細で真珠のような光沢を与えた。
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