the line that comes from a named ancestor: the descendants, family record, or unfolding story that issues from them
This word is built from the verb meaning "to father" or "to bring forth," and that shapes everything about it. It always points forward, to what a person produced, never backward to where that person came from. So "the toledot of Noah" means the family and story that came out of Noah, not the account of his own birth.
It is the backbone of the book of Genesis, where the same phrase, "these are the toledot of so-and-so," introduces each new section, carrying the story forward from the first humans down to the family of Jacob. Sometimes it heads a plain list of names; sometimes it heads a long narrative about a family line. Either way it announces what comes next, not what came before.
The same word does quieter work elsewhere. In the law and especially in Chronicles it becomes a record-keeper's term, the phrase used when people are counted and enrolled by family. In one place it even means the simple order in which children were born. Underneath all of these is one idea: the offspring and the history that flow out of a starting point.