A theory of color vision that assumes three types of cones, usually assumed to be maximally responsive to red, green,...

That segment of the life cycle from ages 18 to 22.  

An experimental method in which the control subject receives the same treatment as the experimental subject on the same schedule....

An alkaloid from the bark of an African tree that is thought by some to have aphrodisiac properties. Yohimbine is...

An instrument used in opium smoking.  

A drowsy but restless state during a drug withdrawal period.  

A craving or desire for drugs or foods.  

In sexology, a vaginal infection caused by Candida albicans, often transmitted sexually. A common vaginal infection usually caused by an...

One of the two opposing forces in eastern philosophy associated with the earth, heat, brightness, activity, and masculinity.  

A beautiful plant which grows in moist shady locations. Flowers deep yellow veined with brown. Formerly employed for diarrhea and...