tower: a tall, strong structure built up above its surroundings for defense, lookout, or sheer height
A מִגְדָּל is anything raised up and built strong. The word names a real and common feature of the ancient landscape:
- a stone bastion set into or beside a city wall
- a freestanding lookout in open country or in a vineyard
- the keep that a town's people fled into when the wall was breached
Its center of gravity is height and strength together, a structure that is both taller and safer than what stands around it.
That single concrete picture is what makes the word stretch so far. Because everyone knew exactly what a tower looked and felt like, the same word could carry weight far beyond architecture. The senses below are not different words but different uses of one image. A tower can be the very stronghold a frightened population runs into (Judges 9:51), and on the strength of that real experience the same phrase, "a strong tower," is turned onto the name of the LORD himself: the place a person runs to and is safe (Proverbs 18:10).
In poetry the picture turns to praise. The Song of Songs compares a woman's neck, nose, and body to towers, borrowing the language of monuments and fortifications to call her stately, strong, and unapproachable. Once, in Nehemiah 8:4, the word leaves defense behind entirely and names a raised wooden platform built so a reader could be seen and heard above the crowd. Even there the common thread holds: a מִגְדָּל is the thing lifted high.