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n. Any of various abnormal conditions in which the physiological effect of a vitamin is produced to a pathological degree by excessive intake of the vitamin.

n. Any medical condition resulting from excessive intake of vitamins.

n. an abnormal condition resulting from taking vitamins excessively; can be serious for vitamins A or D or K

"The liver of one dog contains enough vitamin A to produce the condition called hypervitaminosis A. Mawson did not know this and fed more of the dog livers to Mertz, as the latter was the weaker of the two men, thus causing vitamin A poisoning and facilitating Mertz's demise."

abnormality    abnormalcy