Brain Game: As Easy as ABCD

I was reading the dictionary the other day - yes, I sometimes do that to generate ideas - when I came upon the word "abscond." For some reason, I noticed that there's an "A" and "B" at the beginning, a "C" in the middle, and a "D" at the end. Four consecutive letters of the alphabet. I did some digging for similar words, and today's Brain Game features one of them:

Fill in the four blanks in the following word with four consecutive letters of the alphabet to form a word. _ U _ I _ _ U S

Click here for the answer.

ANSWER: You'd add L, M, N and O to form the word "LUMINOUS."