pseud UK /s(j)uːd/US /suːd/ noun3 •(disapproving) An intellectually pretentious person; a poseur.He and two friends were known as “the three pseuds” among the rest of the boys, who thought them too clever by half. — 2012 •(Internet) A pseudonym. •(informal) Pseudomonas bacteria. formspseuds · pseuds.