radical / radicle [ˈrædɪkəl]
radical – adj., n. & v. – adj. – 1. relating to the origins of something; primary and sometimes extreme; n. – a word or part that cannot be divided into simpler parts; v. – to act in what is considered a fundamental manner
radicle – n. – the primary root of a plant embryo or seedling; the smallest vessel of a blood vessel