Uncertain. Often considered a substratum word related to Albanian moshë or derived from it (compare Romanian feminine form moașă), but can also possibly be from Latin annōsus (“aged, old, full of years”) (with a loss of the initial vowel as in some other cases (compare mătușă, noaten, nămaie), and the -ș- sound formed as with coș. The change of -n- to -m- is more unusual, but has other instances as well (compare măgar, miel, miță). Its presence in all Eastern Romance languages (compare Aromanian mosh, moashi) and the addition of the prefix stră- also indicates that it is an old word and probably from a Latin source. 
moș m (plural moși)
- an old man
- ^ Romanian Explanatory Dictionary
- ^ Alexandru Ciorănescu, Dicționarul etimologic român, s.v. "moș" (Tenerife: Universidad de la Laguna, 1958-1966).
- ^ Dicționarul explicativ al limbii române, ediția a II-a, ed. Academia Română, Institutul de Lingvistică Iorgu Iordan, s.v. "moș" (Univers Enciclopedic, 1998).