Keystone Noun Synonyms
necessity, crux, linchpin, basis, principle, foundation, cornerstone
Predestination was the keystone of his religion.
Science / Marine Biology / Keystone Predator: The dominant predator or the top predator that has a major influence on community structure. For example, sea otters are a keystone predator in kelp beds. Sea otters eat urchins that feed on kelp whic MORE
Science / Marine Biology / Keystone Species: A predator at the top of a food web, or discrete subweb, capable of consuming organisms of more than one trophic level beneath it MORE