adjective

1. of, suitable to, or due from a son or daughter filial devotion
2. Genetics designating or of any generation following the parental: the first filial generation is designated F, the second (produced from the first) F, etc.

Etymology: ME < LL(Ec) filialis, of a son or daughter < L filius, son, filia, daughter < base of femina, fetus: see female