septendec-

From Latin septendecim (“seventeen”), composed of septem (“seven”) + decem (“ten”). Used as a combining form in neoclassical compounds denoting quantities of seventeen.

septendec-

1. Denotes the number seventeen in compound and scientific terms.
   • septendecennial – occurring every seventeen years
   • septendecennium – a period of seventeen years

• septem – combining form for "seven"
• decem – combining form for "ten"
• septendecim – Latin cardinal number for seventeen

• tredec – combining form for thirteen
• duodec – combining form for twelve
• undec – combining form for eleven