spiralium

noun
spi·​ra·​li·​um | \ spīˈrālēəm\
plural spiralia\ -​ēə \

Definition of spiralium

: one of the spirally twisted ribbonlike calcareous supports on the interior of the valve of various extinct brachiopods

History and Etymology for spiralium

New Latin, from Medieval Latin spiralis spiral + New Latin -ium

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