[hahy-grom-i-ter] /haɪˈgrɒm ɪ tər/

any instrument for measuring the water-vapor content of the atmosphere.
any of various instruments for measuring humidity

1660s, from French hygromètre, from Greek hygro- (see hygro-) + -meter. Related: Hygrometry; hygrometric.
Any of several instruments that measure humidity. The most common type of hygrometer consists of two, side-by-side mercury or electronic thermometers, one of which has a dry bulb, and one of which has a bulb wrapped with a wet cotton or linen wick. As water evaporates from the wet bulb, it absorbs heat from the thermometer, driving down its temperature reading. The difference in temperature between the two thermometers is then used to calculate the relative humidity. This type of hygrometer is also called a psychrometer. Other hygrometers make use of the temperatures at which dew forms and disappears to calculate the relative humidity. Older hygrometers used the length of a strand of hair, which stretches when it absorbs moisture, to measure relative humidity.


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  • Hygrometric

    [hahy-gruh-me-trik] /ˌhaɪ grəˈmɛ trɪk/ adjective 1. of or relating to the hygrometer or hygrometry.

  • Hygrometry

    [hahy-grom-i-tree] /haɪˈgrɒm ɪ tri/ noun 1. the branch of physics that deals with the measurement of the humidity of air and gases. hygrometry hy·grom·e·try (hī-grŏm’ĭ-trē) n. See psychrometry.

  • Hygrophilous

    [hahy-gruh-fahyt] /ˈhaɪ grəˌfaɪt/ noun 1. a plant that thrives in wet or very moist ground. 2. a hydrophyte. /haɪˈɡrɒfɪləs/ adjective 1. (of a plant) growing in moist places /ˈhaɪɡrəˌfaɪt/ noun 1. any plant that grows in wet or waterlogged soil

  • Hygrophobia

    noun a fear of moisture, dampness Word Origin hygro- ‘moisture’

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