Source : Webster's Revised Unabridged Dictionary (1913)

Thick \Thick\ (th[i^]k), adv. [AS. [thorn]icce.]
   1. Frequently; fast; quick.

   2. Closely; as, a plat of ground thick sown.

   3. To a great depth, or to a greater depth than usual; as,
      land covered thick with manure.

   {Thick and threefold}, in quick succession, or in great
      numbers. [Obs.] --L'Estrange.

Thick \Thick\, v. t. & i. [Cf. AS. [thorn]iccian.]
   To thicken. [R.]

         The nightmare Life-in-death was she, Who thicks man's
         blood with cold.                         --Coleridge.

Thick \Thick\ (th[i^]k), a. [Compar. {Thicker} (-[~e]r); superl.
   {Thickest}.] [OE. thicke, AS. [thorn]icce; akin to D. dik,
   OS. thikki, OHG. dicchi thick, dense, G. dick thick, Icel.
   [thorn]ykkr, [thorn]j["o]kkr, and probably to Gael. & Ir.
   tiugh. Cf. {Tight}.]
   1. Measuring in the third dimension other than length and
      breadth, or in general dimension other than length; --
      said of a solid body; as, a timber seven inches thick.

            Were it as thick as is a branched oak. --Chaucer.

            My little finger shall be thicker than my father's
            loins.                                --1 Kings xii.
                                                  10.

   2. Having more depth or extent from one surface to its
      opposite than usual; not thin or slender; as, a thick
      plank; thick cloth; thick paper; thick neck.

   3. Dense; not thin; inspissated; as, thick vapors. Also used
      figuratively; as, thick darkness.

            Make the gruel thick and slab.        --Shak.

   4. Not transparent or clear; hence, turbid, muddy, or misty;
      as, the water of a river is apt to be thick after a rain.
      ``In a thick, misty day.'' --Sir W. Scott.

   5. Abundant, close, or crowded in space; closely set;
      following in quick succession; frequently recurring.

            The people were gathered thick together. --Luke xi.
                                                  29.

            Black was the forest; thick with beech it stood.
                                                  --Dryden.

   6. Not having due distinction of syllables, or good
      articulation; indistinct; as, a thick utterance.

   7. Deep; profound; as, thick sleep. [R.] --Shak.

   8. Dull; not quick; as, thick of fearing. --Shak.

            His dimensions to any thick sight were invincible.
                                                  --Shak.

   9. Intimate; very friendly; familiar. [Colloq.]

            We have been thick ever since.        --T. Hughes.

   Note: Thick is often used in the formation of compounds, most
         of which are self-explaining; as, thick-barred,
         thick-bodied, thick-coming, thick-cut, thick-flying,
         thick-growing, thick-leaved, thick-lipped,
         thick-necked, thick-planted, thick-ribbed,
         thick-shelled, thick-woven, and the like.

   {Thick register}. (Phon.) See the Note under {Register}, n.,
      7.

   {Thick stuff} (Naut.), all plank that is more than four
      inches thick and less than twelve. --J. Knowles.

Thick \Thick\, n.
   1. The thickest part, or the time when anything is thickest.

            In the thick of the dust and smoke.   --Knolles.

   2. A thicket; as, gloomy thicks. [Obs.] --Drayton.

            Through the thick they heard one rudely rush.
                                                  --Spenser.

            He through a little window cast his sight Through
            thick of bars, that gave a scanty light. --Dryden.

   {Thick-and-thin block} (Naut.), a fiddle block. See under
      {Fiddle}.

   {Through thick and thin}, through all obstacles and
      difficulties, both great and small.

            Through thick and thin she followed him. --Hudibras.

            He became the panegyrist, through thick and thin, of
            a military frenzy.                    --Coleridge.

Source : WordNet®

thick
     adj 1: not thin; of a specific thickness or of relatively great
            extent from one surface to the opposite usually in the
            smallest of the three solid dimensions; "an inch
            thick"; "a thick board"; "a thick sandwich"; "spread a
            thick layer of butter"; "thick coating of dust";
            "thick warm blankets" [ant: {thin}]
     2: closely crowded together; "a compact shopping center"; "a
        dense population"; "thick crowds" [syn: {compact}, {dense}]
     3: relatively dense in consistency; "thick cream"; "thick
        soup"; "thick smoke"; "thick fog" [ant: {thin}]
     4: spoken as if with a thick tongue; "the thick speech of a
        drunkard"; "his words were slurred" [syn: {slurred}]
     5: wide from side to side; "a heavy black mark" [syn: {heavy}]
     6: hard to pass through because of dense growth; "dense
        vegetation"; "thick woods" [syn: {dense}]
     7: (of darkness) very intense; "thick night"; "thick darkness";
        "a face in deep shadow"; "deep night" [syn: {deep}]
     8: abundant; "a thick head of hair"
     9: heavy and compact in form or stature; "a wrestler of compact
        build"; "he was tall and heavyset"; "stocky legs"; "a
        thick middle-aged man"; "a thickset young man" [syn: {compact},
         {heavyset}, {stocky}, {thickset}]
     10: (used informally) associated on close terms; "a close
         friend"; "the bartender was chummy with the regular
         customers"; "the two were thick as thieves for months"
         [syn: {chummy}, {buddy-buddy}, {thick(p)}]
     11: used informally [syn: {blockheaded}, {boneheaded}, {fatheaded},
          {loggerheaded}, {thickheaded}, {thick-skulled}, {wooden-headed}]
     12: abundantly covered or filled; "the top was thick with dust"

thick
     n : the location of something surrounded by other things; "in
         the midst of the crowd" [syn: {midst}]

thick
     adv 1: with a thick consistency; "the blood was flowing thick"
            [syn: {thickly}] [ant: {thinly}]
     2: in quick succession; "misfortunes come fast and thick" [syn:
         {thickly}]