Webster's Revised Unabridged Dictionary · 1913

Thick

Thick (thik) , adjective

[Old English thicke, Anglo-Saxon þicce; akin to Dutch dik, Old Saxon thikki, Old High German dicchi thick, dense, German dick thick, Icelandic þykkr, þjokkr, and probably to Gael. & Ir. tiugh. Compare 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. — Shakespeare
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. [Rare] — Shakespeare
8.
Dull; not quick; as, thick of fearing. — Shakespeare
His dimensions to any thick sight were invincible. — Shakespeare
9.
Intimate; very friendly; familiar. [Colloquial]
We have been thick ever since. — T. Hughes

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.

Collocations (2)
Thick register (Phonetics) , See the Note under Register, n., 7.
Thick stuff (Nautical) , all plank that is more than four inches thick and less than twelve. — J. Knowles

Thick , noun

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. [Obsolete] — 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
Through thick and thin she followed him. — Hudibras
He became the panegyrist, through thick and thin, of a military frenzy. — Coleridge
Collocations (2)
Thick-and-thin block (Nautical) , a fiddle block. See under Fiddle.
Through thick and thin , through all obstacles and difficulties, both great and small.

Thick (thik) , adverb

[Anglo-Saxon þicce.]

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.
Collocations (1)
Thick and threefold , in quick succession, or in great numbers. [Obsolete] — L'Estrange

Thick , verb, transitive and intransitive

[Compare Anglo-Saxon þiccian.]

To thicken. [Rare]
The nightmare Life-in-death was she, Who thicks man's blood with cold. — Coleridge