τετρᾰδ-ιον, τό,
a guard of soldiers (normally consisting of four men), [[ 1st c.AD: Philo Judaeus 2.533, NT.Act.12.4. ] NT+1st c.AD+]
__II quaternion of parchment, [[ “POxy.” 2156.10 (4th-5th c.AD), 12th c.AD: Tzetzes, Joannes Grammaticus “Historiarum variarum chiliades” 9.290 ] Refs 4th c.AD+]; compare τετράδειον.