From BiblePortal Wikipedia

Morrish Bible Dictionary [1]

1. challamish , 'hard rock,' out of which water was brought.  Deuteronomy 8:15;  Psalm 114:8 . Christ, because of His opposers, set His face like a flint, and He knew He should not be ashamed.  Isaiah 50:7 . God made Jacob to suck oil out of the flinty rock.  Deuteronomy 32:13 .

2. tsor, 'rock.' God made Ezekiel's forehead as an adamant, harder than flint, because of the obduracy of Israel.  Ezekiel 3:9 . The horses' hoofs of God's executors of judgement shall be like flint.  Isaiah 5:28 .

Wilson's Dictionary of Bible Types [2]

 Deuteronomy 8:15 (b) The flint rock is probably the hardest of all the rocks. By this picture the Lord is telling us that He is able to bring great blessing to us out of impossible situations. He often brings deliverance from sources that we never thought of. He is able to use strange circumstances and unknown assets to bring to us the relief that we need. (See  Deuteronomy 32:13;  Psalm 114:8).

 Isaiah 50:7 (a) By this term the Lord is telling us of His determination to go to the limit for our salvation and our blessing. Nothing would swerve Him from this purpose.

Webster's Dictionary [3]

(1): ( n.) A piece of flint for striking fire; - formerly much used, esp. in the hammers of gun locks.

(2): ( n.) Anything extremely hard, unimpressible, and unyielding, like flint.

(3): ( n.) A massive, somewhat impure variety of quartz, in color usually of a gray to brown or nearly black, breaking with a conchoidal fracture and sharp edge. It is very hard, and strikes fire with steel.

King James Dictionary [4]

Flint n.

1. In natural history, a sub-species of quartz, of a yellowish or bluish gray, or grayish black color. It is amorphous, interspersed in other stones, or in nodules or rounded lumps. Its surface is generally uneven, and covered with a rind or crust, either calcarious or argillaceous. It is very hard, strikes fire with steel, and is an ingredient in glass. 2. A piece of the above described stone used in firearms to strike fire. 3. Any thing proverbially hard as a heart of flint.

Holman Bible Dictionary [5]

 Exodus 4:25 Joshua 5:2-3  Deuteronomy 8:15 Psalm 114:8 Deuteronomy 32:13 Ezekiel 3:9 Isaiah 50:7 Luke 9:51 Zechariah 7:12

Easton's Bible Dictionary [6]

 Isaiah 50:7  Ezekiel 3:9  Ezekiel 3:8,9 Isaiah 5:28

Smith's Bible Dictionary [7]

Flint. A well-known stone, a variety of quartz. It is extremely hard, and strikes fire. It was very abundant in and about Palestine.

Hastings' Dictionary of the Bible [8]

FLINT . See Mining and Metals.

International Standard Bible Encyclopedia [9]

flint ( חלמישׁ , ḥallāmı̄sh ( Deuteronomy 8:15;  Deuteronomy 32:13;  Job 28:9;  Psalm 114:8 ), צר , cōr ( Exodus 4:25;  Ezekiel 3:9 ), צר , cēr ( Isaiah 5:28 ), צוּר , cūr ( Job 22:24;  Psalm 89:43 ), צרים , curı̄m ( Joshua 5:2 f); κόχλαξ (= κάχληξ , káchlēx "pebble"), kóchlax (1 Macc 10:73)): The word ḥallāmı̄sh signifies a hard stone, though not certainly flint, and is used as a figure for hardness in   Isaiah 50:7 , "Therefore have I set my face like a flint." A similar use of cōr is found in  Ezekiel 3:9 , "As an adamant harder than flint have I made thy forehead," and  Isaiah 5:28 , "Their horses' hoofs shall be accounted as flint"; and of ṣela‛ in  Jeremiah 5:3 , "They have made their faces harder than a rock." The same three words are used of the rock from which Moses drew water in the wilderness: ḥallāmı̄sh ( Deuteronomy 8:15;  Psalm 114:8 ); cūr ( Exodus 17:6;  Deuteronomy 8:15;  Psalm 78:20;  Isaiah 48:21 ); ṣela‛ ( Numbers 20:8;  Nehemiah 9:15;  Psalm 78:16 ). Cūr and ṣela‛ are used oftener than ḥallāmı̄sh for great rocks and cliffs, but cūr is used also for flint knives in  Exodus 4:25 , "Then Zipporah took a flint (the King James Version "sharp stone"), and cut off the foreskin of her son," and in  Joshua 5:2 f, "Yahweh said unto Joshua, Make thee knives of flint (the King James Version "sharp knives"), and circumcise again the children of Israel the second time." Surgical implements of flint were used by the ancient Egyptians, and numerous flint chippings with occasional flint implements are found associated with the remains of early man in Syria and Palestine. Flint and the allied mineral, chert, are found in great abundance in the limestone rocks of Syria, Palestine and Egypt. See Rock .

Cyclopedia of Biblical, Theological and Ecclesiastical Literature [10]

( חִלָּמִושׁ , Challassish', from its Smoothness,  Psalms 104:8;  Isaiah 50:7; "rock,"  Job 28:9; frequently with the accompaniment צוּר , a rock,  Deuteronomy 8:15;  Deuteronomy 32:13; once for צר itself,  Ezekiel 3:9; "sharp stone,"  Exodus 4:25), 'any hard stone, especially of a silicious character, as quartz or granite; but in mineralogical science it is applied only to silicious nodules. In the three passages first cited above the reference is to God's bringing water and oil out of the naturally barren rocks of the wilderness for the sake of his people. In Isaiah the word is used metaphorically to signify the firmness of the prophet is resistance to his persecutors. So also in,  Isaiah 5:28 we have Like Flsnt, in reference to the hoofs of horses. In 1 Mace. 10:73, Κόχλαξ is translated flint, and in  Wisdom of Solomon 11:4 the expression Ἐκ Πέτρας Ἀκροτόμου is adopted from  Deuteronomy 8:15 (Sept.). (See Rock). 'Flints abound in nearly' all the plains and valleys through which the Hebrews marched during thee forty years of wandering.' In the northward desert, low hills' of chalk occur, as well as frequent tracts of chalky soil, for the most part overspread with flints. In the western desert Burckheardt saw some large pieces of flint perfectly oval three to four feet in length, and about a foot and a half in breadth. This desert presents to the traveller's view its immense expanse of dreary country, covered with black flints, with here and there some hilly chains rising fromthe plain. (See Desert).

The Nuttall Encyclopedia [11]

1, a maritime county of North Wales, between Lancashire and Denbigh, of which a detached portion lies to the N. of Shropshire; low stretches of sand form its foreshore, but inland it is hilly, with here and there a picturesque and fertile valley in which dairy-farming is extensively carried on. 2, a seaport, on the estuary of the Dee, 13 m. NW. of Chester; has ruins of a castle with interesting historical associations; in the neighbourhood are copper-works and lead and coal mines.