An alternative form of concentric, meaning having a shared center point.
A variant form of concentric formed by adding the suffix -al, common in older English texts. Both forms were used interchangeably from the 16th-18th centuries, though concentric became standard.
This word shows how English sometimes creates multiple forms of the same adjective—concentrical lost the competition with concentric, but you'll find it in Renaissance texts where both forms lived side by side.
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