>>72553
Smith was intentionally vague about it. It was Eugen Böhm von Bawerk that started the push towards clarity. Initially, there were two types of definitions for Capital - the vague and inconsistent Smithian kind and overly specific that excludes other forms of Capital. So he begins by contracting where it's possible and broadening where needed to arrive at something that makes sense for once.
"The product of past labor" excludes future potential value of capital and is not sufficient or accurate. There can be no human capital in "past labor", nor venture capital.