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greyhound (n.): Old English grighund (West Saxon), greghund (Anglian) "greyhound," probably from grig- "bitch," a word of unknown etymology, + hund "dog" (see hound (n.)). The first element in the name apparently has nothing to do with color, as most of the hounds are not gray, but the exact sense of it must have been early forgotten, as it has been long associated with the color in popular imagination. In some Middle English forms it appears to be conformed to Grew, an old word for "Greek" (from Old French Griu). The Old Norse form of the word is preserved in Hjalti's couplet that almost sparked war between pagans and Christians in early Iceland:
Vilkat goð geyja
grey þykkjumk Freyja

I will not blaspheme the gods,
but I think Freyja is a bitch
Ossianic (adj.): 1808, in reference to Oisin, name of a legendary Gaelic bard, literally "little fawn;" James Macpherson claimed to have collected and translated his works (1760-1763) under the name Ossian, and the poetic prose sparked a Celtic revival and fascination with the glamor of the lost world of the bards. The work turned out to be Macpherson's forgery, and the style later was regarded as bombastic, but the resulting swerve in European literature was real.
spark (v.): c. 1200, "to emit sparks," from spark (n.). Meaning "to affect by an electrical spark" is from 1889. Figurative meaning "stimulate, to trigger" first attested 1912. Meaning "to play the gallant, to court" is from the 17c. secondary sense of the noun. Related: Sparked; sparking.
spirit (n.): mid-13c., "animating or vital principle in man and animals," from Anglo-French spirit, Old French espirit "spirit, soul" (12c., Modern French esprit) and directly from Latin spiritus "a breathing (respiration, and of the wind), breath; breath of a god," hence "inspiration; breath of life," hence "life;" also "disposition, character; high spirit, vigor, courage; pride, arrogance," related to spirare "to breathe," from PIE *(s)peis- "to blow" (cognates: Old Church Slavonic pisto "to play on the flute").

Meaning "supernatural immaterial creature; angel, demon; an apparition, invisible corporeal being of an airy nature" is attested from mid-14c.; from late 14c. as "a ghost" (see ghost (n.)). From c. 1500 as "a nature, character"; sense of "essential principle of something" (in a non-theological context, as in Spirit of St. Louis) is attested from 1680s, common after 1800; Spirit of '76 in reference to the qualities that sparked and sustained the American Revolution is attested by 1797 in William Cobbett's "Porcupine's Gazette and Daily Advertiser."

From late 14c. in alchemy as "volatile substance; distillate;" from c. 1500 as "substance capable of uniting the fixed and the volatile elements of the philosopher's stone." Hence spirits "volatile substance;" sense narrowed to "strong alcoholic liquor" by 1670s. This also is the sense in spirit level (1768). Also from mid-14c. as "character, disposition; way of thinking and feeling, state of mind; source of a human desire;" in Middle English freedom of spirit meant "freedom of choice." From late 14c. as "divine substance, divine mind, God;" also "Christ" or His divine nature; "the Holy Ghost; divine power;" also, "extension of divine power to man; inspiration, a charismatic state; charismatic power, especially of prophecy." Also "essential nature, essential quality." From 1580s in metaphoric sense "animation, vitality."

According to Barnhart and OED, originally in English mainly from passages in Vulgate, where the Latin word translates Greek pneuma and Hebrew ruah. Distinction between "soul" and "spirit" (as "seat of emotions") became current in Christian terminology (such as Greek psykhe vs. pneuma, Latin anima vs. spiritus) but "is without significance for earlier periods" [Buck]. Latin spiritus, usually in classical Latin "breath," replaces animus in the sense "spirit" in the imperial period and appears in Christian writings as the usual equivalent of Greek pneuma. Spirit-rapping is from 1852.
Thule: region or island at northernmost part of the world, Old English, from Latin, from Greek Thyle "land six days' sail north of Britain" (Strabo, quoting a lost portion of a work by Polybius, itself based on a lost account of a voyage to the north by 4c. B.C.E. geographer Pytheas). The identity of the place and the source of the name have sparked much speculation; Polybius doubted the whole thing, and since Roman times the name has been used in a transferred sense of "extreme limits of travel" (Ultima Thule).
The barbarians showed us where the sun set. For it happened in those places that the night was extremely short, lasting only two or three hours; and the sun sunk under the horizon, after a short interval reappeared at his rising." [Pytheas]
The name was given to a trading post in Greenland in 1910, site of a U.S. air base in World War II.
yellow ribbon: The American folk custom of wearing or displaying a yellow ribbon to signify solidarity with loved ones or fellow citizens at war originated during the U.S. embassy hostage crisis in Iran in 1979. It does not have a connection to the American Civil War, beyond the use of the old British folk song "Round Her Neck She Wore A Yellow Ribbon" in the John Wayne movie of the same name, with a Civil War setting, released in 1949. The story of a ribbon tied to a tree as a signal to a convict returning home that his loved ones have forgiven him is attested from 1959, but the ribbon in that case was white.

The ribbon color seems to have changed to yellow first in a version retold by newspaper columnist Pete Hamill in 1971. The story was dramatized in June 1972 on ABC-TV (James Earl Jones played the ex-con). Later that year, Irwin Levine and L. Russell Brown copyrighted the song "Tie a Yellow Ribbon Round the Ole Oak Tree," which became a pop hit in early 1973 and sparked a lawsuit by Hamill, later dropped.

In 1975, the wife of a Watergate conspirator put out yellow ribbons when her husband was released from jail, and news coverage of that was noted and remembered by Penne Laingen, whose husband was U.S. ambassador to Iran in 1979 and one of the Iran hostages taken in the embassy on Nov. 4. Her yellow ribbon in his honor was written up in the Dec. 10, 1979, "Washington Post." When the hostage families organized as the Family Liaison Action Group (FLAG), they took the yellow ribbon as their symbol. The ribbons revived in the 1991 Gulf War and again during the 2000s wars in Afghanistan and Iraq.