se tenant
adjective
se te·nant sə-ˈte-nənt 
sē-;
ˌse-tə-ˈnäⁿ
of postage stamps
: joined together as in the original sheet but differing in design, overprint, color, or perforation
Word History
Etymology
French, literally, holding one another
First Known Use
circa 1911, in the meaning defined above