Definition of "half-round" [half-round]

• A hemisphere. (noun)
• In architecture, a molding whose profile is a semicircle. It may be either a bead or a torus. (noun)
• Semicircular or semicylindrical: as, a half-round file, etc.

The Century Dictionary (Public Domain)

• "I was unable to get additional information on it, but it is chambered in. 30-'06 with a half-round, half-octagon barrel, and topped (of course) with a Leupold variable."
• "She was slicing them into these half-round rainbows."
• "Congenital tracheal stenosis (narrowing due to a birth defect) is a rare condition in which the cartilage "rings" in the trachea, normally two half-round pieces of cartilage facing one another, fuse together into solid rings during fetal development."