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| situated under the tongue, or on the underside of the tongue |
| a series of paired nerves that originate in the spinal cord and emerge, branching out to the region of the neck, trunk, or limbs |
dilator di·la·tor (dī-lā'tər, dī'lā'-, dĭ-lā'-)
n.
An instrument or a substance for enlarging a cavity, canal, blood vessel, or opening.
A muscle that dilates an orifice or a body part, such as a blood vessel or the pupil of the eye. Also called dilatator.