blockers

[blok-er]

block·er

[blok-er]
noun
1.
a person or thing that blocks.
2.
Football. a player whose assignment or special skill is blocking.
3.
Biochemistry. a substance that inhibits the physiological action of another substance, as the beta blocker propranolol that interferes with neurotransmitters in the sympathetic nervous system.

Origin:
1200–50; Middle English; see block, -er1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Blockers is always a great word to know.
So is quincunx. Does it mean:
a scrap or morsel of food left at a meal.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
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