Dietitian

An expert in the practical application of diet in the prevention of disease or of a process that can lead to disease, and in the treatment of disease. Plan and conduct food-service or nutritional programs to assist in the promotion of health and disease control. May...

Differentiate

The process cells undergo as they mature into normal cells. Differentiated cells have distinctive characteristics, perform specific functions, and are less likely to divide. See dedifferentiate, undifferentiated.

Diffuse

Lacking a distinct border, not localized, spread out. Opposite of circumscribed. Widely spread; not localized or confined. Example: Cancer treatment depends on whether the tumor is diffuse (spread throughout the brain) or focal (in one area of the brain).

Doppler Ultrasonography

An application of diagnostic ultrasound used to detect moving blood cells or other moving structures and measure their direction and speed of movement. The Doppler effect is used to evaluate movement by measuring changes in frequency of the echoes reflected from...