diet
A diet measures a person’s eating and drinking habits.
digestion
Digestion is the process of digesting food, and takes place after eating.
dioptre
A dioptre is the measurement used by ophthalmologists to measure your eyesight.
disability
A disability is a lack of ability or difficulty to do something which may be physical or mental, or both physical and mental.
disease
People have a disease when they have pain in one or many parts of their body.