Consisting of one cell only. Some organisms, such as bacteria, are unicellular. Unicellular is in contrast to multicellular.

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  • Unicornuate

    Having one horn, or being horn shaped. For example, the uterus is normally unicornuate.

  • Unilateral

    Having, or relating to, one side. For example, a unilateral rash is one that is only on one side of the body.

  • Uniparous

    1) Having produced only one offspring. Also called primiparous. 2) Producing only one offspring at a time. See also multiparous.

  • Unique identifier reporting

    In public health, a system that uses information such as the person’s birth date and part of their identification number (in the U.S., the social security number) to create a unique code that is reported instead of a name. It is an alternative to named reporting that provides some of the surveillance benefits of reporting […]

  • Unit, international (IU)

    An international unit (IU) is an internationally accepted amount of a substance. This type of measure is used for the fat-soluble vitamins (such as vitamins A, D and E) and certain hormones, enzymes, and biologicals (such as vaccines). The definition of an international unit (IU) is generally arbitrary, technical, and eminently forgettable. For example, an […]

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