A conjecture is an assertion made on the basis of incomplete evidence. I'm not familiar with Turing's work in this area but if (as others have commented) he stu

A conjecture is an assertion made on the basis of incomplete evidence. I'm not familiar with Turing's work in this area but if (as others have commented) he studied PDEs and that appear to mimic biological processes, yet did not find a definitive link, then the conclusion that a connection between the two may exist can only be described as conjecture.