Latin dē, especially in etymollogy of deduction, usually means "of" - meaning: regarding, in respect of, concerning etc. (Look de facto, de jure, de dato, de futuro...);
with dūcō - meaning to lead, to guide forming deducere as present active infinitive;
in contrast with the prefix ab which usually means "from" or "away from" as in "ab ovo" where "de ovo" would mean something regarding the egg instead of originating from or away from the egg (also look ab initio, ab extra, ab hinc...).
Similair to the word absent coming from latin absens, absum where ab means "away from" and sum means "I am", taken together meaning "not present".
Thus in the context of logic where deduce would mean going in one way, abduce would imply going away from that way i.e. reverse direction.
with dūcō - meaning to lead, to guide forming deducere as present active infinitive;
in contrast with the prefix ab which usually means "from" or "away from" as in "ab ovo" where "de ovo" would mean something regarding the egg instead of originating from or away from the egg (also look ab initio, ab extra, ab hinc...).
Similair to the word absent coming from latin absens, absum where ab means "away from" and sum means "I am", taken together meaning "not present".
Thus in the context of logic where deduce would mean going in one way, abduce would imply going away from that way i.e. reverse direction.