sex ‧ tu ‧ plet /sekˈstjuːplət, sekˈstjuːplɪt $ -ˈstʌ-/ BrE AmE noun [countable]
[ Date: 1800-1900 ; Origin: sextuple 'six times' (17-21 centuries) , from Late Latin sextuplex , from Latin sextus 'sixth' ]
one of six people who are born at the same time and have the same mother