mamsien.
/ˈmamzi/, U.S. /ˈmæmzi/ colloquial. Now rare.
A child's affectionate word (or name) for ‘Mother’.
ΚΠ
1857 ‘G. Eliot’ Janet's Repentance vii, in Blackwood's Edinb. Mag. Aug. 195/1 Good morning, Mamsey!
1886 Catholic World Sept. 738 My heart is pretty strong... Emptiness is the one thing that could hurt it—like Mamsey's boiler, that cracked with heat, because it was not kept properly filled.
1890 C. M. Yonge Mrs. Batseyes iv, in More Bywords 257 Mamsey, you know a model parish stifles me... I won't have you sighing, mother.
1891 L. T. Meade Sweet Girl Graduate xvi. 135 Oh, mamsie, such a sealskin! and such coral!
This is a new entry (OED Third Edition, June 2000; most recently modified version published online March 2022).
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n.1857