The word "遐想" is formed by combining the character "遐", meaning distant, which incorporates the radical "辶" for movement or distance and the phonetic component "叚", with the character "想", meaning to think, which includes the radical "心" for mind and the phonetic component "相"; semantically, "遐" modifies "想" to express the concept of thoughts wandering far away, hence reverie or daydream.