It is ghiscari, the old pure tongue. It means ”mother”
”noble lord, you are in the presence of daenerys stormborn of house targaryen, queen of the andals and the first men, khaleesi of the great grass sea, breaker of chains and mother of dragons”
”I came all this way to tell you that… you saw more in me, than I ever saw in myself. and I was scared I couldn’t live up to that image. it was easier just to wreck it all, which I did. I know how much I hurt you, zoe. but everything that I have done since, everything that I want to do, is to be that man you saw. and if you would even consider giving me another chance… I’m ready. I’m ready to be here for you in every way. I love you, zoe hart”