(mathematics) A function which, when applied a given number of times, equals another given function.

(mathematics) The number which, when squared, yields another number. / (mathematics) The positive number which, when squared, yields another number; the principal square root.

The pressure (the result of osmosis) exerted by the roots of vascular plants that moves water into the leaves and causes guttation.

To dig or pull up by the roots; to deracinate.

(computing) Alternative spelling of rootkit

a reflex in infants in which the head is turned towards any stimulus; used to find the nipple

(phytopathology) Any of several plant fungal diseases caused by having over-wet roots.

plural of root beer

(anatomy) The hollow part of the root of a tooth, containing the nerve and blood vessels. / (dentistry) A surgical operation on a root canal, typically filling it with gutta-percha.

(botany) Any adventitious root that grows from a plant stem above ground.