percopsiforms
(climbing) A device, used to clip on a rope, that tightens when weight is applied, thus allowing the rope to be climbed.
present participle of pass under the yoke
(geology, paleontology) A subdivision of the Carboniferous period.
plural of percopsiform
標本を整理していた魚類学者は、小川の魚の中にいくつかのパーコプス形目の仲間を見つけた。
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