1. a group or set of eight things or people
Usage: formal or technical
2. in chemistry, an atom or radical with a valence of eight
Usage: chemistry

Examples

• The choir performed as an octad, with eight singers arranged in two rows.
• An octad of musicians took the stage for the chamber performance.
• The research team consisted of an octad of scientists from different institutions.
• In the periodic table, certain elements form an octad when bonding with other atoms.
• The festival featured an octad of different cultural performances throughout the week.