Definition: The word "Amalthea" appears in the New Revised Standard Version (NRSV) of the Bible, which translates to "whiter than snow" or "light as snow." It comes from Greek and means a light colored thing. In its original sense, the word is often used metaphorically to describe something that is bright and luminous without being white. It can also be used to describe something that appears or seems like it has been covered in an amalthea effect.