Someone who has a disease caused by breathing in tiny bits of a hard mineral called silica.
Being silicotic is not good. It means someone is sick because they breathed in something bad.
Examples:
The silicotic man had trouble breathing.
She became silicotic after working in the mine.
The silicotic workers needed help.
The silicotic cat couldn't breathe well.
The silicotic town had many sick people.
The silicotic dog coughed a lot.