1.  gill(n = noun.quantity) - a British imperial capacity unit (liquid or dry) equal to 5 fluid ounces or 142.066 cubic centimeters;
is a kind of british capacity unit, imperial capacity unit
is a part of pint
has parts: fluid ounce, fluidounce

2.  gill(n = noun.quantity) - a United States liquid unit equal to 4 fluid ounces;
is a kind of united states liquid unit
is a part of cup
has parts: fluid ounce, fluidounce

3.  gill(n = noun.plant) lamella - any of the radiating leaflike spore-producing structures on the underside of the cap of a mushroom or similar fungus;
is a kind of plant organ

4.  gill(n = noun.animal) branchia - respiratory organ of aquatic animals that breathe oxygen dissolved in water;
is a kind of respiratory organ
has particulars: ctenidium, ceras, external gill

1.  An organ for aquatic respiration; a branchia. [1913 Webster]
" Gills are usually lamellar or filamentous appendages, through which the blood circulates, and in which it is exposed to the action of the air contained in the water. In vertebrates they are appendages of the visceral arches on either side of the neck. In invertebrates they occupy various situations." [1913 Webster]
"Fishes perform respiration under water by the gills." [1913 Webster]

2.  The radiating, gill-shaped plates forming the under surface of a mushroom. [1913 Webster]

3.  The fleshy flap that hangs below the beak of a fowl; a wattle. [1913 Webster]

4.  The flesh under or about the chin. Swift. [1913 Webster]

5.  One of the combs of closely ranged steel pins which divide the ribbons of flax fiber or wool into fewer parallel filaments. [1913 Webster]

   A two-wheeled frame for transporting timber. [1913 Webster]

   A leech. Jameison. [1913 Webster]

   A woody glen; a narrow valley containing a stream. [1913 Webster]

   A measure of capacity, containing one fourth of a pint. [1913 Webster]

1.  A young woman; a sweetheart; a flirting or wanton girl. B. Jonson. [1913 Webster]

2.  The ground ivy (Nepeta Glechoma); -- called also gill over the ground, and other like names. [1913 Webster]

3.  Malt liquor medicated with ground ivy. [1913 Webster]

gill, n. & v.
--n. (usu. in pl.)
1 the respiratory organ in fishes and other aquatic animals.
2 the vertical radial plates on the underside of mushrooms and other fungi.
3 the flesh below a person's jaws and ears (green about the gills).
4 the wattles or dewlap of fowls.
--v.tr.
1 gut (a fish).
2 cut off the gills of (a mushroom).
3 catch in a gill-net.

Idiom:
gill-cover a bony case protecting a fish's gills; an operculum. gill-net a net for entangling fishes by the gills.

Derivative:
gilled adj. (also in comb.).

gill, n.
1 a unit of liquid measure, equal to a quarter of a pint.
2 Brit. dial. half a pint.

gill, n. (also ghyll) Brit.
1 a deep usu. wooded ravine.
2 a narrow mountain torrent.

gill, n. (also Gill, jill, Jill)
1 derog. a young woman.
2 colloq. or dial. a female ferret.

Etymology:
ME, abbr. of Gillian f. OF Juliane f. L Juliana (Julius)

N  sharpness, acuity, acumination, spinosity, point, spike, spine, spicule, spiculum, needle, hypodermic needle, tack, nail, pin, prick, prickle, spur, rowel, barb, spit, cusp, horn, antler, snag, tag thorn, bristle, Adam's needle, bear grass, tine, yucca, nib, tooth, tusk, spoke, cog, ratchet, crag, crest, arete, cone peak, sugar loaf, pike, aiguille, spire, pyramid, steeple, beard, chevaux de frise, porcupine, hedgehog, brier, bramble, thistle, comb, awn, beggar's lice, bur, burr, catchweed, cleavers, clivers, goose, grass, hairif, hariff, flax comb, hackle, hatchel, heckle, wedge, knife edge, cutting edge, blade, edge tool, cutlery, knife, penknife, whittle, razor, razor blade, safety razor, straight razor, electric razor, scalpel, bistoury, lancet, plowshare, coulter, colter, hatchet, ax, pickax, mattock, pick, adze, gill, billhook, cleaver, cutter, scythe, sickle, scissors, shears, pruning shears, cutters, wire cutters, nail clipper, paper cutter, sword, bodkin, belduque, bowie knife, paring knife, bushwhacker, drawing knife, drawing shave, microtome, chisel, screwdriver blade, flint blade, guillotine, sharpener, hone, strop, grindstone, whetstone, novaculite, steel, emery, sharp, keen, acute, acicular, aciform, aculeated, acuminated, pointed, tapering, conical, pyramidal, mucronate, mucronated, spindle shaped, needle shaped, spiked, spiky, ensiform, peaked, salient, cusped, cuspidate, cuspidated, cornute, cornuted, cornicultate, prickly, spiny, spinous, spicular, thorny, bristling, muricated, pectinated, studded, thistly, briary, craggy, snaggy, digitated, two-edged, fusiform, dentiform, denticulated, toothed, odontoid, starlike, stellated, stelliform, sagittate, sagittiform, arrowheaded, arrowy, barbed, spurred, acinaciform, apiculate, apiculated, aristate, awned, awny, bearded, calamiform, cone-shaped, coniform, crestate, echinate, gladiate, lanceolate, lanciform, awl, awl-shaped, lance-shaped, awl- shaped, scimitar-shaped, sword-shaped, setarious, spinuliferous, subulate, tetrahedral, xiphoid, cutting, sharp edged, knife edged, sharp as a razor, keen as a razor, sharp as a needle, sharp as a tack, sharpened, set.

N  river, running water, jet, spirt, spurt, squirt, spout, spray, splash, rush, gush, jet d'eau, sluice, water spout, water fall, cascade, force, foss, lin, linn, ghyll, Niagara, cataract, rapids, white water, catadupe, cataclysm, debacle, inundation, deluge, chute, washout, rain, rainfall, serein, shower, scud, downpour, driving rain, drenching rain, cloudburst, hyetology, hyetography, predominance of Aquarius, reign of St. Swithin, mizzle, drizzle, stillicidum, plash, dropping, falling weather, northeaster, hurricane, typhoon, stream, course, flux, flow, profluence, effluence, defluxion, flowing, current, tide, race, coulee, spring, artesian well, fount, fountain, rill, rivulet, gill, gullet, rillet, streamlet, brooklet, branch, runnel, sike, burn, beck, creek, brook, bayou, stream, river, reach, tributary, geyser, spout, waterspout, body of water, torrent, rapids, flush, flood, swash, spring tide, high tide, full tide, bore, tidal bore, eagre, hygre, fresh, freshet, indraught, reflux, undercurrent, eddy, vortex, gurge, whirlpool, Maelstrom, regurgitation, overflow, confluence, corrivation, wave, billow, surge, swell, ripple, anerythmon gelasma, beach comber, riffle, rollers, ground swell, surf, breakers, white horses, whitecaps, rough sea, heavy sea, high seas, cross sea, long sea, short sea, chopping sea, hydrodynamics, hydraulics, hydraulicostatics, rain gauge, flowmeter, pegology, irrigation, pump, watering pot, watering cart, hydrant, syringe, garden hose, lawn spray, bhisti, mussuk, fluent, diffluent, profluent, affluent, tidal, flowing, meandering, meandry, meandrous, fluvial, fluviatile, streamy, showery, rainy, pluvial, stillicidous, stillatitious, for men may come and men may go but I go on foreve, that old man river, he just keeps rolling along.

external gill, gill arch, gill bar, gill cleft, gill fungus, gill net, gill slit