Pronunciation: (fil'ē-ul), [key]
1. of, pertaining to, or befitting a son or daughter: filial obedience.
2. noting or having the relation of a child to a parent.
3. Genetics.pertaining to the sequence of generations following the parental generation, each generation being designated by an F followed by a subscript number indicating its place in the sequence.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.