trey-

“three, the number three”

Widely acceptednumber

three, triple

Root for the number three, yielding Latin tres, English three, Greek treis.

del-“to count, recount, tell”dwo-“two, a pair”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”