Oak

Boyd’s Bible Dictionary:

(strong). Three varieties in Palestine, usually of great girth and expanse, but not noted for height (Gen. 35:88But Deborah Rebekah's nurse died, and she was buried beneath Beth-el under an oak: and the name of it was called Allon-bachuth. (Genesis 35:8); Judg. 6:11,1911And there came an angel of the Lord, and sat under an oak which was in Ophrah, that pertained unto Joash the Abiezrite: and his son Gideon threshed wheat by the winepress, to hide it from the Midianites. (Judges 6:11)
19And Gideon went in, and made ready a kid, and unleavened cakes of an ephah of flour: the flesh he put in a basket, and he put the broth in a pot, and brought it out unto him under the oak, and presented it. (Judges 6:19); 2 Sam. 18:9-149And Absalom met the servants of David. And Absalom rode upon a mule, and the mule went under the thick boughs of a great oak, and his head caught hold of the oak, and he was taken up between the heaven and the earth; and the mule that was under him went away. 10And a certain man saw it, and told Joab, and said, Behold, I saw Absalom hanged in an oak. 11And Joab said unto the man that told him, And, behold, thou sawest him, and why didst thou not smite him there to the ground? and I would have given thee ten shekels of silver, and a girdle. 12And the man said unto Joab, Though I should receive a thousand shekels of silver in mine hand, yet would I not put forth mine hand against the king's son: for in our hearing the king charged thee and Abishai and Ittai, saying, Beware that none touch the young man Absalom. 13Otherwise I should have wrought falsehood against mine own life: for there is no matter hid from the king, and thou thyself wouldest have set thyself against me. 14Then said Joab, I may not tarry thus with thee. And he took three darts in his hand, and thrust them through the heart of Absalom, while he was yet alive in the midst of the oak. (2 Samuel 18:9‑14)).

Concise Bible Dictionary:

Oak at Tibnah
There are four Hebrew words so translated, but they are all apparently from the same root, signifying “strong, hardy,” and are mostly applied to the oak, which lives to a great age. Three species of the Quercus are known in Palestine, the pseudo-coccifera, cegilops, and iafectoria. It is symbolical of strength, and affords shade from the heat of the sun (Gen. 35:88But Deborah Rebekah's nurse died, and she was buried beneath Beth-el under an oak: and the name of it was called Allon-bachuth. (Genesis 35:8); Josh. 24:2626And Joshua wrote these words in the book of the law of God, and took a great stone, and set it up there under an oak, that was by the sanctuary of the Lord. (Joshua 24:26); Isa. 1:2929For they shall be ashamed of the oaks which ye have desired, and ye shall be confounded for the gardens that ye have chosen. (Isaiah 1:29); Isa. 2:1313And upon all the cedars of Lebanon, that are high and lifted up, and upon all the oaks of Bashan, (Isaiah 2:13); Ezek. 27:66Of the oaks of Bashan have they made thine oars; the company of the Ashurites have made thy benches of ivory, brought out of the isles of Chittim. (Ezekiel 27:6); Hos. 4:1313They sacrifice upon the tops of the mountains, and burn incense upon the hills, under oaks and poplars and elms, because the shadow thereof is good: therefore your daughters shall commit whoredom, and your spouses shall commit adultery. (Hosea 4:13); Amos 2:99Yet destroyed I the Amorite before them, whose height was like the height of the cedars, and he was strong as the oaks; yet I destroyed his fruit from above, and his roots from beneath. (Amos 2:9); Zech. 11:22Howl, fir tree; for the cedar is fallen; because the mighty are spoiled: howl, O ye oaks of Bashan; for the forest of the vintage is come down. (Zechariah 11:2)). The word elah is judged to refer to the terebinth (pistacia terebinthus), though generally translated oak (Gen. 35:44And they gave unto Jacob all the strange gods which were in their hand, and all their earrings which were in their ears; and Jacob hid them under the oak which was by Shechem. (Genesis 35:4); Judg. 6:11,1911And there came an angel of the Lord, and sat under an oak which was in Ophrah, that pertained unto Joash the Abiezrite: and his son Gideon threshed wheat by the winepress, to hide it from the Midianites. (Judges 6:11)
19And Gideon went in, and made ready a kid, and unleavened cakes of an ephah of flour: the flesh he put in a basket, and he put the broth in a pot, and brought it out unto him under the oak, and presented it. (Judges 6:19); 2 Sam. 18:9-149And Absalom met the servants of David. And Absalom rode upon a mule, and the mule went under the thick boughs of a great oak, and his head caught hold of the oak, and he was taken up between the heaven and the earth; and the mule that was under him went away. 10And a certain man saw it, and told Joab, and said, Behold, I saw Absalom hanged in an oak. 11And Joab said unto the man that told him, And, behold, thou sawest him, and why didst thou not smite him there to the ground? and I would have given thee ten shekels of silver, and a girdle. 12And the man said unto Joab, Though I should receive a thousand shekels of silver in mine hand, yet would I not put forth mine hand against the king's son: for in our hearing the king charged thee and Abishai and Ittai, saying, Beware that none touch the young man Absalom. 13Otherwise I should have wrought falsehood against mine own life: for there is no matter hid from the king, and thou thyself wouldest have set thyself against me. 14Then said Joab, I may not tarry thus with thee. And he took three darts in his hand, and thrust them through the heart of Absalom, while he was yet alive in the midst of the oak. (2 Samuel 18:9‑14); 1 Kings 13:1414And went after the man of God, and found him sitting under an oak: and he said unto him, Art thou the man of God that camest from Judah? And he said, I am. (1 Kings 13:14); 1 Chron. 10:1212They arose, all the valiant men, and took away the body of Saul, and the bodies of his sons, and brought them to Jabesh, and buried their bones under the oak in Jabesh, and fasted seven days. (1 Chronicles 10:12); Isa. 1:3030For ye shall be as an oak whose leaf fadeth, and as a garden that hath no water. (Isaiah 1:30); Ezek. 6:1313Then shall ye know that I am the Lord, when their slain men shall be among their idols round about their altars, upon every high hill, in all the tops of the mountains, and under every green tree, and under every thick oak, the place where they did offer sweet savor to all their idols. (Ezekiel 6:13)).
Silhouette of shepherd and sheep under a giant oak at Ain Samieh.