Correct spelling for the English word "Defluous" is [dɪflˈuːəs], [dɪflˈuːəs], [d_ɪ_f_l_ˈuː_ə_s] (IPA phonetic alphabet).
The word "defluous" does not have a well-established etymology as it is a relatively uncommon term and its origins are not widely documented. However, de- is a prefix that usually means "opposite" or "remove", and -fluous is derived from the Latin word "fluere", meaning "to flow". Based on this, "defluous" could be understood as something that counters or inhibits the flow of something. However, it should be noted that this interpretation is speculative and not definitively rooted in linguistic history.