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dodecagonal

a. Having twelve sides and twelve angles

Usage examples of "dodecagonal".

The corners of each bar joined its mates on the inside of the barrel, forming a dodecagonal tube about three inches in diameter.

Next you tow your twelve moons into place, positioning them so that they occupy the same synchronous orbit in a stable dodecagonal configuration.

Only the sensory stalks remained the same, feeding the developing brain a dodecagonal impression of the world around it.