Etymology
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Scilly 

isles off Cornwall, a name of unknown origin. Pliny has Silumnus, Silimnis. Perhaps it is connected with the Roman god Sulis (compare Aquae sulis "Bath," literally "waters of Sulis"). The -y might be Old Norse ey "island." The -c- was added 16c.-17c. "[A]bout the only certain thing that can be said is that the c of the modern spelling is not original but was added for distinction from ModE silly as this word developed in meaning from 'happy, blissful' to 'foolish.'" ["Cambridge Dictionary of English Place-Names"].

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grouse (n.)

type of game bird, 1530s, grows (plural, used collectively), of unknown origin, possibly from Latin or Welsh. Originally the moorhen of the British Isles; later the name was extended to similar birds in other places.

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broch (n.)

prehistoric stone tower of the Scottish Highland and isles, 1650s, from Scottish English broch, from Old Norse borg "castle," cognate with Old English burh (see borough).

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puffin (n.)

North Atlantic seabird, the sea-parrot or bottle-nosed auk, mid-14c., poffoun, perhaps connected with puff on some quality of its appearance, or from some Celtic word (the earliest association is with Cornwall and Scilly) and altered by influence of puff.

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prawn (n.)

"long-tailed, ten-footed shrimp-like crustacean, abundant on the shores of the British Isles," early 15c., prayne, a word of unknown origin. "No similar name found in other langs." [OED].

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salsify (n.)

biennial plant with an esculent root, native to the British Isles and extensively cultivated as a vegetable, 1710, from French salsifis, earlier sercifi, sassify (16c.), which is probably from Italian erba salsifica, from Old Italian salsifica, a word of uncertain origin, perhaps from Latin sal "salt" (from PIE root *sal- "salt") + fricare "to rub" (see friction). Among the native names is goatsbeard.

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croft (n.)

"small piece of enclosed ground for agricultural purposes, a very small farm," especially of those on the western coast and isles of Scotland. Old English croft "enclosed field, small field," of unknown etymology. Germanic and Celtic sources have been proposed.

Crofter "tenant who holds a small field, one who occupies a croft," especially "small farmer on the western coast and islands of Scotland," is by 1762 (from late 13c. as a surname), originally Scottish.

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Culdee (n.)

member of an irregular monastic order of priests in the Middle Ages in the Celtic lands of the British Isles, mid-12c., from Old Irish céle de "anchorite," from cele "associate, companion," sometimes "servant" (compare ceilidh) + de "of God." Perhaps an attempt to translate Servus Dei or some other Latin term for "religious hermit." Related: Culdean.

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British (adj.)

Old English Bryttisc "of or relating to (ancient) Britons," from Bryttas "natives of ancient Britain" (see Briton). The meaning "of or pertaining to Great Britain" is from c. 1600; the noun meaning "inhabitants of Great Britain" is from 1640s. British Empire is from c. 1600. First modern record of British Isles is from 1620s. British English as the form of the English language spoken in Britain is by 1862 (George P. Marsh). Related: Britishness.

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Briton (n.)

c. 1200, "a Celtic native of the British Isles," from Anglo-French Bretun, from Latin Brittonem (nominative Britto, misspelled Brito in MSS) "a member of the tribe of the Britons," from *Britt-os, the Celtic name of the Celtic inhabitants of Britain and southern Scotland before the 5c. Anglo-Saxon invasion drove them into Wales, Cornwall, and a few other corners. In 4c. B.C.E. Greek they are recorded as Prittanoi, which is said to mean "tattooed people."

In Middle English it was exclusively in historical use, or in reference to the inhabitants of Brittany (see Breton); it was revived when James I was proclaimed King of Great Britain in 1604, and made official at the union of England and Scotland in 1707.

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