Etymology
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clot (n.)

Old English clott "a round mass, lump," from Proto-Germanic *klutto- (source also of Dutch kloot "ball," Danish klods "a block, lump," German Klotz "lump, block"); probably related to or confused with cleat and clod (q.v.). Of blood from 1610s,

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obstructive (adj.)

"having the quality of obstructing, serving or intended to hinder, delay, or annoy," 1610s, from Latin obstruct-, past-participle stem of obstruere "to build up, block, block up, build against, stop, bar, hinder" (see obstruction) + -ive.

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obstruct (v.)

1610s, "to block or stop up with obstacles or impediments," a back-formation from obstruction or else from Latin obstructus, past participle of obstruere "build up, block, block up, build against, stop, bar, hinder," from ob "in front of, in the way of" (see ob-) + struere "to pile, build" (from PIE *streu-, extended form of root *stere- "to spread"). Figurative sense of "to hinder, impede, retard, delay" (justice, the law, etc.) is by 1640s. Related: Obstructed; obstructing.

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Rhode Island 

U.S. state, the region is traditionally said to have been named by Italian explorer Giovanni da Verrazzano when he passed through in 1524, based on an imagined similarity between modern Block Island and the Greek Isle of Rhodes. More likely it is from Roodt Eylandt, the name Dutch explorer Adriaen Block gave to Block Island c. 1614, literally "red island," so called for the color of its cliffs. Under this theory, the name was altered by 17c. English settlers by folk-etymology influence of the Greek island name (see Rhodes) and then extended to the mainland part of the colony. By 1685 the island had been renamed for Block. The Rhode Island red domestic fowl was so called by 1896, for its plumage.

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sunscreen (n.)
1738 as an object to block the sun's rays, from sun (n.) + screen (n.). As a type of lotion applied to the skin, by 1954.
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monolithic (adj.)

1802, "formed of a single block of stone;" 1849, "of or pertaining to a monolith," from monolith + -ic. Figurative use from 1920. Related: Monolithal (1813).

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insula (n.)
Latin, literally "an island" (also, in ancient Rome, "a block of buildings"); see isle. In anatomical use, the notion is "detached or standing out by itself."
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up (v.)

1550s, "to drive and catch (swans)," from up (adv.). Intransitive meaning "get up, rise to one's feet" (as in up and leave) is recorded from 1640s. Sense of "to move upward" is recorded from 1737. Meaning "increase" (as in up the price of oil) is attested from 1915. Compare Old English verb uppian "to rise up, swell." Related: Upped; upping. Upping block, used for mounting or dismounting horses, carriages, etc., is attested from 1796 (earlier was horsing-block, 1660s).

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briquette (n.)
also briquet, "small brick," 1870, especially "block of compressed coal dust held together by pitch," used for fuel, from French briquette (18c.), diminutive of brique (see brick (n.)).
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knub (n.)
"small lump, butt-end or piece," 1560s, probably cognate with Low German knubbe "knot, knob," Danish knub "block, log, stump" (see knob).
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