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| a white, crystalline, water-insoluble, powerful high explosive, C3H6N6O6, used chiefly in bombs and shells. |
| the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language). |
xerophthalmia xe·roph·thal·mi·a (zēr'ŏf-thāl'mē-ə)
n.
Extreme dryness of the conjunctiva resulting from disease localized in the eye or from a systemic deficiency of vitamin A. Also called xeroma.