n. 25B6; noun CENTRAL COMPONENT, central figure, centrepiece, prop, linchpin, cornerstone, pillar, bulwark, buttress, chief support, backbone, anchor, foundation, base, staple.
MAINSTAY
Meaning of MAINSTAY in English
Concise Oxford thesaurus English vocabulary. Краткий оксфордский словарь английского языка тезаурус. 2012