centiron Noun, n, centiron belt Appox. usage (any sense): 0.015 per million words Appox. usage (any sense): 0.015 per million words
centuron Noun, n, centuron obsolete form of centiron Appox. usage (any sense): less than 0.1 per million words Appox. usage (any sense): less than 0.1 per million words