grand-
1.
a combining form used in genealogical terminology meaning “one generation more remote”:
grandfather; grandnephew.
Origin
special use of
grand
British Dictionary definitions for
grand-
grand-
prefix
1.
(in designations of kinship) one generation removed in ascent or descent:
grandson,
grandfather
Word Origin
from French
grand-,
on the model of Latin
magnus
in such phrases as
avunculus magnus
great-uncle