Definition of annulus

• n. - A ring; a ringlike part or space.
• n. - A space contained between the circumferences of two circles, one within the other.
• n. - The solid formed by a circle revolving around a line which is the plane of the circle but does not cut it.
• n. - Ring-shaped structures or markings, found in, or upon, various animals.
• n. - A ring; a ringlike part or space.
• n. - A space contained between the circumferences of two circles, one within the other.
• n. - The solid formed by a circle revolving around a line which is the plane of the circle but does not cut it.
• n. - Ring-shaped structures or markings, found in, or upon, various animals.