annulusPronunciation: /ˈanjʊləs/Definition of annulus noun (plural annuli /-lʌɪ, -liː/) technical a ring-shaped object, structure, or region. Mathematics a plane figure consisting of the area between a pair of concentric circles. Origin: mid 16th century: from Latin anulus, annulusannulus in other Oxford dictionaries Definition of annulus in the US English dictionary
