Dis forDiscussion
When two or more people are discussing something, they are having a discussion.
Disdain is a way of treating someone as if you dislike them and they are beneath you. The woman is looking at the man who is approaching her with disdain.
You, or a part of your body, is diseased if it is not working properly for some reason. Disease can be caused by a contagious illness, poison, genetic condition or other imbalances.
A disguise is something you wear to make yourself look like someone or something else.
The man in the photo is in his 20s and is disguised as a much older man, with makeup, glasses and a false moustache.
You feel disgust when you have a sudden, very strong dislike of something. Some smells, like rotten food, are disgusting. The person in the picture is disgusted.
Dis forDisinfectant
Disinfectant is a substance that is used, usually while cleaning, to kill most germs and micro-organisms it comes into contact with. Disinfectants by no means kill all micro-organisms, which can cause its own set of problems as the ones that survive can then breed with less competition from the other micro-organisms that the disinfectant killed.