#antifonar

• Antiphon — A material, device, or chemical compound used for soundproofing, noise reduction, or acoustical vibration damping (especially in automotive or construction industries); in Christian liturgical music (theology), it represents a hymn, verse, or psalm sung alternatively by two separate choirs.
• Antiphonary — A liturgical book used in the Christian Church (especially in the Roman Catholic and ancient Byzantine traditions) containing the antiphons, verses, psalms, and hymns designated to be sung alternatively by two choirs throughout the liturgical year.
• Soundproofing — The act of soundproofing and its result; the technical process of applying an acoustic insulating layer, bituminous mastic, or sound-absorbing material onto a surface to diminish noise, damp mechanical vibrations, and provide an effective barrier against corrosion.