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(used of opinions and actions) far beyond the norm;
"extremist political views"
"radical opinions on education"
"an ultra conservative"
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markedly new or introducing radical change;
"a revolutionary discovery"
"radical political views"
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arising from or going to the root or source;
"a radical flaw in the plan"
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of or relating to or constituting a linguistic root;
"a radical verb form"
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especially of leaves; located at the base of a plant or stem; especially arising directly from the root or rootstock or a root-like stem;
"basal placentation"
"radical leaves"