珍 (zhēn) is a bound root meaning 'precious' or 'valuable'. It does not typically stand alone as a word; instead, it appears as the first or second element in compound words such as 珍惜 (zhēnxī, to cherish), 珍贵 (zhēnguì, precious), and 珍珠 (zhēnzhū, pearl). You will not use 珍 by itself in speech or writing — it always combines with another character to form a complete word.