dioptrie Noun, f, dioptrie diopter Appox. usage (any sense): 0.096 per million words Appox. usage (any sense): 0.096 per million words
dioptru Noun, n, dioptru diopter Appox. usage (any sense): less than 0.1 per million words Appox. usage (any sense): less than 0.1 per million words