mighty (man), lintel, oak, post, ram, tree

Boyd’s Bible Dictionary:

(strong). Three varieties in Palestine, usually of great girth and expanse, but not noted for height (Gen. 35:8; Judg. 6:11,19; 2 Sam. 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. 35:8; Josh. 24:26; Isa. 1:29; Isa. 2:13; Ezek. 27:6; Hos. 4:13; Amos 2:9; Zech. 11:2). The word elah is judged to refer to the terebinth (pistacia terebinthus), though generally translated oak (Gen. 35:4; Judg. 6:11,19; 2 Sam. 18:9-14; 1 Kings 13:14; 1 Chron. 10:12; Isa. 1:30; Ezek. 6:13).
Silhouette of shepherd and sheep under a giant oak at Ain Samieh.

Strong’s Dictionary of Hebrew Words:

Transliteration:
’ayil
Phonic:
ah’-yil
Meaning:
from the same as 193; properly, strength; hence, anything strong; specifically a chief (politically); also a ram (from his strength); a pilaster (as a strong support); an oak or other strong tree
KJV Usage:
mighty (man), lintel, oak, post, ram, tree