See under water stress.
Water stress is one aspect of the complex process of water balance in plants. Other components are water extraction and water storage capacity (see there in detail).

There are several terms that signify a stress situation for plants in connection with water supply. These are soil moisture stress, drought, moisture stress, drought stress, water shortage and water stress. They are sometimes used interchangeably as synonyms. There is no internationally recognised nomenclature.
The term "drought" refers to a lack of water in a larger geographical area over a longer period of time due to insufficient precipitation. However, it can also refer to the condition of plants with withered leaves and dried grapes due to various causes.
Water stress" occurs when the water supply to the roots is limited and/or when the...
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