The first syllable is re-, not ru-
schwaOne syllable of reticulate is stressed and four are not. Unstressed English vowels all sound roughly alike, so the letters in them are unrecoverable from the sound.
heard asruticulate
spelledreticulate
saidri-TIK-yuu-lut
reticulate.
It looks like the ordinary prefix re-, the one in return and rebuild, and it is not. Those three letters are the front of rete, the Latin word for a net, and the word cannot be taken apart at that point. Nothing is being done again here.
The rest of the net
retikulate reticculate reticulete raticulate reticulute retticulate
The complete set is one click away. All 11 spellings of reticulate.