Root

kořen

(part of a plant)

kořen

(of a tooth)

kořen

(part of a hair under the skin)

kořen

(primary source)

kořen

(linguistic morphology: primary lexical unit of a word)

kořínek

(part of a hair under the skin)

odmocnina

(arithmetic: number or expression which when raised to a power gives the specified number or expression)

root

(person who manages accounts on a UNIX system)