People in the industry also sought to develop rigid, gas-permeable lenses made primarily with siloxane-containing components.
Silicone compounds in these formulations consist mostly of linear dimethyl siloxane polymers.
British Dictionary definitions for siloxane
siloxane
/sɪˈlɒkseɪn/
noun
1.
any of a class of compounds containing alternate silicon and oxygen atoms with the silicon atoms bound to hydrogen atoms or organic groups. Many are highly complex polymers See also silicone