grandmother

the mother of one's father or mother; a woman who is the grandmother of someone

abuela, bisabuela

Collocations grandmother and granddaughter

• She is my grandmother's sister.

  Ella es la hermana de mi abuela.

a woman who acts as a grandmother to someone, even if she is not related to them

abuela adoptiva

Collocations grandmother figure

• She became a grandmother to her friend's children.

  Se convirtió en abuela de los hijos de su amiga.