Something is dilated if it has become bigger or wider. The eye in the picture is dilated.
Dis forDisappointed
When you become a little sad because something doesn't work out the way you thought it would, you are disappointed.
The head is the topmost part of your body. On the front of your head is your face, and on the top and back of your head you grow hair. All animals, insects, birds and fish have heads, except for some tiny organisms that are so small we cannot see them. Your head is joined to your body by your neck. The photo is a mannequin's head.