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jetty: jetty: [15] A jetty is a structure that literally projects or is ‘thrown’ out beyond what surrounds it. The word was borrowed from Old French jetee, where it originated as the past participle of the verb jeter ‘throw’ (source also of English jet, as in ‘jet engine’). It was used originally both for a structure jutting out into a body of water, and for a projecting upper storey of a house, of which the latter now survives only as a technical term in architectural history.
=> jet
cantilever (n.): 1660s, probably from cant (n.2) + lever, but earliest form (c. 1610) was cantlapper. First element also might be Spanish can "dog," architect's term for an end of timber jutting out of a wall, on which beams rested. Related: Cantilevered.
groyne (n.): "strong, low sea wall," 1580s, perhaps from obsolete groin "pig's snout" (c. 1300; the wall so called because it was thought to look like one), from Old French groin "muzzle, snout; promontory, jutting part," from Latin grunnire "to grunt" (compare English colloquial grunter "a pig").
jut (v.1): "to protrude," mid-15c., corruption of obsolete jet (see jetty). Related: Jutted; jutting.
jut (v.2): "to strike, hit, push," 1540s, echoic. Related: Jutted; jutting.
mull (n.): "promontory" (in Scottish place names), late 14c., perhaps from Old Norse muli "a jutting crag, projecting ridge (between two valleys)," which probably is identical with muli "snout, muzzle." The Norse word is related to Old Frisian mula, Middle Dutch mule, muul, Old High German mula, German Maul "muzzle, mouth." Alternative etymology traces it to Gaelic maol "brow of a hill or rock," also "bald," from Old Celtic *mailo-s (cognates: Irish maol, Old Irish máel, máil, Welsh moel).
pin (n.): late Old English pinn "peg, bolt," from Proto-Germanic *penn- "jutting point or peak" (cognates: Old Saxon pin "peg," Old Norse pinni "peg, tack," Middle Dutch pin "pin, peg," Old High German pfinn, German Pinne "pin, tack") from Latin pinna "a feather, plume;" in plural "a wing;" also "fin, scoop of a water wheel;" also "a pinnacle; a promontory, cape; battlement" (as in Luke iv:9 in Vulgate) and so applied to "points" of various sorts, from PIE *pet- (see pen (n.1)).

Latin pinna and penna "a feather, plume," in plural "a wing," are treated as identical in Watkins, etc., but regarded as separate (but confused) Latin words by Tucker and others, who derive pinna from PIE *spei- "sharp point" (see spike (n.1)) and see the "feather/wing" sense as secondary.

The modern slender wire pin is first attested by this name late 14c. Transferred sense of "leg" is recorded from 1520s and hold the older sense. Pin-money "annual sum allotted to a woman for personal expenses on dress, etc." is attested from 1620s. Pins and needles "tingling sensation" is from 1810. The sound of a pin dropping as a type of something all but silent is from 1775.
prominence (n.): 1590s, "projection," from obsolete French prominence (16c.), from Latin prominentia "a jutting out" (see prominent). Meaning "distinction, conspicuousness" is attested by 1827. As a type of solar phenomenon, from 1862.
prominent (adj.): mid-15c., "projecting, jutting out," from Latin prominentem (nominative prominens) "prominent," present participle of prominere "jut or stand out, be prominent, overhang," from pro- "before, forward" (see pro-) + minere "to project," from minae "projections, threats" (see menace (n.)). Meaning "conspicuous" is from 1759; that of "notable, leading" is from 1849. Related: Prominently.
shag (n.): 1590s, "cloth having a velvet nap on one side," perhaps from Old English sceacga "rough matted hair or wool," from Proto-Germanic *skagjan (cognates: Old Norse skegg, Swedish skägg "beard"), perhaps related to Old High German scahho "promontory," Old Norse skagi "a cape, headland," with a connecting sense of "jutting out, projecting." But the word appears to be missing in Middle English. Of tobacco, "cut in fine shreds," it is recorded from 1789; of carpets, rugs, etc., from 1946.