(botany) root (part of a plant) / (dentistry) root (part of a tooth)

(mathematics) square root (number whose square is equal to a given number)

(mathematics) cube root (number whose cube is equal to a given number)

(countable) horseradish (Armoracia rusticana, a plant of the mustard family) / (uncountable) horseradish (condiment made from the root of the horseradish plant)

root beer (beverage made with sarsaparilla root)

(idiomatic) to solve a problem by dealing with the causes instead of just the consequences

plural of cerveja de raiz

(idiomatic) to die, to kick the bucket, to bite the dust, to give up the ghost, to go west, to be pushing up daisies

(idiomatic) to attack or destroy what is causing a problem rather than the problem itself / (idiomatic) to attack or destroy the nucleus of a problem