Term: time-ball: a ball that slides down a staff to show a fixed time; especially at an observatory
Broader: ball: an object with a spherical shape | Unrelated: oil stain: a stain produced by oil
Broader: ball: an object with a spherical shape | Unrelated: opsin: retinal protein formed by the action of light on rhodopsin
Broader: ball: an object with a spherical shape | Unrelated: rhyniaceae: primitive plants of the Paleozoic
Broader: ball: an object with a spherical shape | Unrelated: uranyl nitrate: a yellow salt obtained by the reaction of uranium salts with nitric acid
Broader: ball: an object with a spherical shape | Unrelated: boletus pulverulentus: an edible fungus with a broadly convex blackish brown cap and a pore surface that is yellow when young and darkens with age; stalk is thick and enlarges toward the base
Broader: ball: an object with a spherical shape | Unrelated: quark cheese: fresh unripened cheese of a smooth texture made from pasteurized milk, a starter, and rennet
Broader: ball: an object with a spherical shape | Unrelated: pinstripe: a fabric with very thin stripes
Broader: ball: an object with a spherical shape | Unrelated: nominating speech: an address (usually at a political convention) proposing the name of a candidate to run for election
Broader: ball: an object with a spherical shape | Unrelated: fringe: one of the light or dark bands produced by the interference and diffraction of light
Broader: ball: an object with a spherical shape | Unrelated: shuteye: informal term for sleep