Entertainment / Baseball / Keystone Sack: Second base.
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Keystone Noun Synonyms: necessity, crux, linchpin, basis, principle, foundation, cornerstone
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Sack Noun Synonyms: pouch, bag, poke, sac
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Business / Construction / Sack Mix: The amount of Portland cement in a cubic yard of concrete mix. Generally, 5 or 6 sack is required in a foundation wall. MORE
Entertainment / Football / Sack: Tackling a ball carrier who intends to throw a forward pass. A sack is also awarded if a player forces a fumble of the ball, or the ball carrier to go out of bounds, behind the line of scrimmage on an 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
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
Entertainment / Baseball / Keystone Sack: Second base. MORE