[sex.to.dec.i.mo] n, pl -mos [L, abl. of sextus decimus sixteenth, fr. sextus sixth + decimus tenth--more at dime] (1688): sixteenmo
SEXTODECIMO
Meaning of SEXTODECIMO in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012