Definition from Wiktionary, the free dictionary
- (family) Of a family relationship that includes mothers, fathers, sisters, brothers, daughters, and sons, etc. as opposed to collateral.
Derived terms 
Related terms 
- lineal in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913
- lineal in The Century Dictionary, The Century Co., New York, 1911
lineal m and f (plural lineales)