Etymology
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jersey (n.)

1580s as a type of knitted cloth; 1842 as a breed of cattle; both from Jersey, one of the Channel Islands. Its name is said to be a corruption of Latin Caesarea, the Roman name for the island (or another near it), influenced by Old English ey "island" (see island); but it is perhaps rather a Viking name (perhaps meaning "Geirr's island").

The meaning "woolen knitted close-fitting tunic," especially one worn during sporting events, is from 1845. In American English, short for New Jersey from 1758. Related: Jerseyman.

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fern (n.)

Old English fearn "fern," from Proto-Germanic *farno- (source also of Old Saxon farn, Middle Dutch vaern, Dutch varen, Old High German farn, German Farn). Watkins and other sources propose an etymology on the notion of "having feathery fronds" from a possible PIE *por-no- "feather, wing" (source also of Sanskrit parnam "feather, leaf;" Lithuanian papartis "fern;" Russian paporot'; Greek pteris "fern"), a proposed suffixed form of the root *per- (2) "to lead, pass over," on the notion of "that which carries a bird in flight."

The plant's ability to appear as if from nothing accounts for the ancient belief that fern seeds conferred invisibility (1590s). Filicology "science or study of ferns" (1848) is from Latin filix "fern."

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New Jersey 
named 1664 by one of the proprietors, Sir George Carteret, for his home, the Channel island of Jersey. Jersey girl attested from 1770.
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fern-tickles (n.)
"freckles, spots or blemishes on the body" (late 14c.), of unknown origin. Related: Fern-tickled "having spots or blemishes on the skin."
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brake (n.2)
kind of fern, early 14c.; see bracken.
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brake (n.3)
"thicket; place overgrown with bushes, brambles, or brushwood," mid-15c., originally "fern-brake, thicket of fern," perhaps from or related to Middle Low German brake "rough or broken ground," from the root of break (v.). Or, more likely, from Middle English brake "fern" (c. 1300), from Old Norse (compare Swedish bräken, Danish bregne), and related to bracken. In the U.S., applied to cane thickets.
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bracken (n.)
"coarse fern," c. 1300, a northern England word, probably from a Scandinavian source (compare Danish bregne, Swedish bräken "fern"), from Proto-Germanic *brak- "undergrowth, bushes," from PIE root *bhreg- "to break" on the notion of "that which impedes motion" [Watkins].
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pteridology (n.)

"the study of ferns as a branch of botany," 1850, with -logy + from Greek pteris "fern, bracken," probably originally "feather plant," so called for the form of the leaves, and related to pteron "wing" (from PIE root *pet- "to rush, to fly"). Compare fern, also supposed to be descended from a root meaning "feather." Related: Pteridologist (1845).

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Trenton 
city in New Jersey, U.S., originally Trent's Town, from William Trent, Philadelphia merchant who laid it out in 1714.
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Guernsey 

Channel Island, the name is Viking. The second element of the name is Old Norse ey "island" (compare Jersey); the first element uncertain, traditionally meaning "green," but perhaps rather representing a Viking personal name, such as Grani.

Like neighboring Jersey, its name also was taken as the word for a coarse, close-fitting vest of wool (1839), worn originally by seamen, and in Australia the word supplies many of the usages of jersey in U.S. As a type of cattle bred there, from 1784.

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