xanthine |
| noun
- (chemistry) any of a group of alkaloids, that include caffeine, theophylline, and theobromine as well as the parent compound, a precursor of uric acid found in many organs of the body
| | xanthophyll |
| noun - (organic chemistry) Any of various hydroxy, carbonyl or carboxylic acid derivatives of carotenes.
- (organic compound) Alternative name for lutein.
| xenobiotic |
| adjective
- Relating to a substance foreign to the body or ecological system.
| xylitol |
| noun - (chemistry) a pentahydric alcohol, C5H12O5, penta-hydroxy pentane; derived from xylose; used as a sweetener
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