A complex; an aggregate of parts; a complication.(noun)
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Use "complexus" in a sentence
"a recent vogue for the extensive misuse, usually tautological misuse, of the word "complexus" -- an excellent word if used rarely and for definite purposes."
"Mr. Haseman and those whose bad example he in this instance follows use "complexus" in much the same spirit as that displayed by the famous old lady who derived religious -- instead of scientific -- consolation from the use of "the blessed word Mesopotamia.""
"They have created a complexus of confusion but it all goes back to three or four Satanic heresies."