NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,886 terms related to cancer and medicine.

Browse the dictionary by selecting a letter of the alphabet or by entering a cancer-related word or phrase in the search box.

vitreous humor
(VIH-tree-us HYOO-mer)
The clear jelly-like substance that fills the inside of the eyeball. As a person ages, the vitreous humor becomes more liquid.