sex-, sexi-, sext-

(Latin: six, sixth; a word element for number 6)

Don't confuse this sex- with another one that refers to "mating" or "gender".

sexennium
sexivalent
sexpartite
sexradiate
sextant
sextet
sextile
sextillion
sextillionth
sextodecimo
sextuple
sextupled
sextuples
sextuplet
sextuplicate