costae
(geology) A linear channel eroded through bedrock by the passage of glacial ice.
(weaponry) A medieval polearm, fitted to a long handle, sometimes with an L-shaped tine or a spike protruding from the side or the end of the blade for tackling the opponent; a bill
xeroradiograph
plural of costa
古生物学者は、その生物の呼吸機構を推測するために化石化した肋骨を注意深く調べた。
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