words related to number "seventeen":
Greek word DEKAEPTA means "seventeen", and DEKATOS EBDOMOS means "seventeenth", [Divry's Modern English-Greek, Greek-English Dictionary, 1988, p. 762].
Turkish cardinal numeral for "seventeen" is "ONYEDI" and for ordinal numeral "seventeenth" is "ONYEDINCI".
a) When the Greek word DEKAEPTA, meaning "seventeen", is rearranged in two parts as "DEKA-EPTA", we have the two terms DEKA and EPTA which were explained under Item 12 - Greek words related to number "ten" and under Item 9 - Greek words related to number "seven" respectively. There we found that DEKA was part of Greek words which were made up from Turkish expressions that used Turkish numeral ON meaning "ten", and EPTA was made up from Turkish cardinal numeral "YEDI" meaning "seven".
Thus, the Greek cardinal numeral name DEKAEPTA is fabricated from Turkish cardinal numeral "ONYEDI" meaning "seventeen", but in an indirect and disguised way.
b) In the case of ordinal numeral "seventeenth", we note that the Greek term DEKATOS meaning "tenth" also has the form DEKATON meaning "tenth", [Divry's dictionary, p. 468]. This makes the composite Greek ordinal numeral name DEKATOS EBDOMOS also as DEKATON EBDOMOS.
When the Greek ordinal numeral name DEKATON EBDOMOS, meaning "seventeenth", rearranged as "ON-BEDEMSADO-O-KT", it is found as being an anagrammatized form of the Turkish expression "ONYEDIMCIDU O" (ONYEDINCIDI O) meaning "it is the seventeenth".
Thus, the Greek ordinal numeral "DEKATON EBDOMOS" (DEKATOS EBDOMOS) gets its meaning and the format from the extended Turkish ordinal numeral name ONYEDINCIDI O meaning "it is the seventeenth" together with some linguistic wrapping text.
So, the linguistic source materials used in fabricating these Greek numeral terms have been taken from old Turkish and anagrammatized as numeral names in "Greek"!