ˈ ̷ ̷ˌ ̷ ̷ noun
1.
a. : a tower on which a sentinel is or may be placed : lookout
b. : an observation point
from this somewhat unpromising watchtower … surveyed English life — Quarterly Review
2. archaic : lighthouse
3. : a turret-shaped projection of the cephalothorax of a spider supporting an eye