HEALTH & DISEASE A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z                    HOME ABOUT CATEGORIES SITE MAP COPYRIGHT ADVERTISE CONTACT entire Web this site caffeine Or trimethylxanthine (C8H10N4O2), an alkaloid extracted from coffee, and also found in tea, cocoa, and cola. Caffeine stimulates the central nervous system and heart, and is a diuretic. It increases alertness, in excess causing insomnia, and is mildly addictive. Melting point 238°C. Related category    • HEALTH AND DISEASE Also on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History Transport Concepts & Designs (partner site) BACK TO TOP