dwo-

“two, a pair”

Widely acceptednumber

two, dual, double

Root for the number two, yielding Latin duo, English two, Greek dyo, Sanskrit dva.

del-“to count, recount, tell”déḱm̥“ten, a decade”h₁newn̥“nine, the number nine”h₃eḱtō“eight, the number eight”penkʷe“five, the number five”sem-“one, together”sem-₂“one, same, together”septm̥“seven, the number seven”