祖父;老爷爷
Grandfather \Grand"fa"ther\, n. A father's or mother's father; an ancestor in the next degree above the father or mother in lineal ascent. {Grandfather longlegs}. (Zo["o]l.) See {Daddy longlegs}.
grandfather n : the father of your father or mother [syn: {gramps}, {granddad}, {grandad}, {granddaddy}, {grandpa}]