| adolescence | Developmental transition between childhood and adulthood entailing major physical, cognitive, and psychosocial changes. 396
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| adolescent growth spurt | Sharp increase in height and weight that precedes sexual maturity. 400
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| anorexia nervosa | Eating disorder character-ized by self-starvation and extreme weight loss. 407
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| bulimia nervosa | Eating disorder in which a person regularly eats huge quantities of food and then purges the body by laxatives, induced vomiting, fasting, or excessive exercise. 408
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| menarche | A girl's first menstruation. 401
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| primary sex characteristics | Organs directly related to reproduction, which enlarge and mature during adolescence. 399
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| puberty | Process by which a person attains sexual maturity and the ability to reproduce. 396
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| secondary sex characteristics | Physiological signs of sexual maturation (such as breast development and growth of body hair) that do not involve the sex organs. 399
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| secular trend | Trend that can be seen only by observing several generations, such as the trend toward earlier attainment of adult height and sexual maturity, which began a century ago. 401
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| spermarche | A boy's first ejaculation. 401
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| substance abuse | Repeated, harmful use of a substance, usually alcohol or other drugs. 409
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| substance dependence | Addiction (physical or psychological, or both) to a harmful substance. 409
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