(psychoanalysis) Of or relating to psychoanalysis.

(medicine) An infection by Chlamydia bacteria, caught from infected birds, and characterised by fever, pneumonia and headaches.

(music) A zither-like musical instrument consisting of a soundboard with multiple strings, played by plucking the strings with the fingers or a plectrum.

plural of psalm

(onomatopoeia) Implies that the speaker is sending secret or whispered information to another person.

(informal) To say psst, to get someone's attention or to communicate with them.

(derogatory) An intellectually pretentious person; a poseur.

(medicine, colloquial) Pseudomonas bacteria.

(Internet slang) A pseudonym.

(physics) A subatomic particle with an unusually long lifetime and a large mass; a bound state of a charm quark and an anti-charm quark.