lineal
1. [ adjective ] in a straight unbroken line of descent from parent to child
Synonyms: direct
Examples:

"lineal ancestors" "lineal heirs" "a direct descendant of the king" "direct heredity"

Related terms: collateral matrilineal patrilineal unilateral related
2. [ adjective ] arranged in a line
Related terms: linear
Similar spelling:   lineally
  lienal
  Lionel
  Linnell