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Portuguese of or pertaining to Portugal or its people, culture, language, or the like. [3 definitions]
Portuguese man-of-war a sea hydrozoan found in warm oceans, having a bladderlike sac that resembles a sail and allows it to float, and trailing many long stinging tentacles that may inflict severe injury.
portulaca any of various related annual plants that have thick stems and leaves and bear small, brightly colored flowers that open only in sunlight.
pose1 to take or hold a bodily position, as in modeling clothing or having one's likeness painted or photograph taken. [7 definitions]
pose2 to puzzle or embarrass with a difficult problem or question.
Poseidon in Greek mythology, the god of the sea; Neptune.
poser1 one who poses; poseur.
poser2 a vexing or confusing question or problem.
poseur one who adopts an affected attitude or manner in order to impress others.
posh costly and elegant; luxurious.
posit to assume or set down as a fact or as a given. [3 definitions]
position the location of a person or thing. [9 definitions]
positive definite; certain. [13 definitions]
positive electricity a deficiency of electrons in an object, causing an attraction for negatively charged objects.
positively in a positive way. [3 definitions]
positivism the philosophy that observable facts from the sciences, rather than metaphysical speculation, are the only allowable basis of knowledge and thought.
positron in physics, an elementary particle equal to an electron in mass, spin, and magnitude of charge, but whose charge is positive.
positronium a short-lived atomic system that a positron and electron form before they destroy each other.
posology the branch of pharmacology that deals with the dosages of drugs.
poss. abbreviation of "possessive."
posse a group of citizens summoned by a county law enforcement official and given temporary legal authority to assist in law enforcement, as for pursuit of a criminal. [2 definitions]