noun
progenitor
proh-JEN-ih-ter/prəʊˈdʒenɪtər/
An ancestor from which a line descends.
The old apple tree is the progenitor of the younger trees.

Etymology
A progenitor is literally one who begets or produces forth, originally an ancestor or family founder. That relationship also supplies the broader sense of an original source from which something develops.
In context
IBM designed what it called a random access disc drive, which IBM calls the quote progenitor of all hard disk drives created since end quote.
More examples
- Our family records identify Samuel as the progenitor of this branch.
- These wild plants are progenitors of several cultivated varieties.
- She traces her ancestry to a progenitor who lived in Virginia.
Forms
progenitor · progenitors
Similar words
- ancestor
- Ancestor covers any earlier relative, not necessarily a line's founder.
- forebear
- Forebear usually refers to a human ancestor, especially a distant one.