What is "thick register"

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.

   Syn: Dense; close; compact; solid; gross; coarse.