sextant /seksˈtənt/

1. The sixth part of a circle or its circumference, a sector or an arc of 60º
2. An instrument with an arc of a sixth of a circle, for measuring angular distances, esp a navigating instrument incorporating a small telescope
3. (with cap; also Sexˈtans /-tənz/) a constellation, lying over the equator
4. (also sexˈtans /-tənz/) a Roman bronze coin worth a sixth of an as (historical)

sextantal /-tantˈl/ adjective

• top-booted
• top boots
• top brass
• topcoat
• topcoats
• top dead centre
• top dog
• top dogs
• top-down
• top drawer
• top-drawer
• top drawers
• top-dress
• top-dressed
• top-dresses
• top dressing
• top-dressing
• top dressings
• tope
• topectomies
• topectomy
• toped
• topee
• topees
• topek