Adjective
1. so thin as to transmit light;
"a hat with a diaphanous veil""filmy wings of a moth""gauzy clouds of dandelion down""gossamer cobwebs""sheer silk stockings""transparent chiffon""vaporous silks"2. resembling or characteristic of vapor;
"vaporous clouds"3. filled with vapor;
"miasmic jungles""a vaporous bog"