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protective providing or intending to provide protection.
protector a person who guards against harm or danger; guardian. [2 definitions]
protectorate a smaller, weaker, or less developed country or territory under the protection and partial control of a larger or stronger one.
protégé a person under the care or sponsorship of an influential patron.
protégée a girl or woman under the care or sponsorship of an influential patron.
protein any of a group of complex organic compounds containing nitrogen and composed of chains of amino acids, found in all living organisms and considered essential to all animal life processes.
pro tem. abbreviation of "pro tempore" (Latin); for the time being; temporarily. [2 definitions]
pro tempore (Latin) for a time; for the time being; temporarily. [2 definitions]
proteolysis the breaking down of proteins by gastric secretions into simpler, soluble compounds, as in digestion.
proteose any of several water-soluble compounds derived from the breakdown of proteins during digestion.
Proterozoic see Algonkian.
protest a statement or other expression of objection or dissent. [7 definitions]
Protestant any Christian, esp. in the West, who belongs to a non-Catholic church. [3 definitions]
Protestant Episcopal Church a U.S. church descended from and modeled on the Church of England but separate and autonomous since 1789; Episcopal Church.
Protestant ethic a set of beliefs in the moral virtue of productive work, self-discipline, and frugality; Protestant work ethic; work ethic.
protestation an emphatic or earnest declaration. [3 definitions]
protester one who formally declares oneself against a policy, action, or decision. [2 definitions]
Proteus in Greek mythology, a sea god who can change his shape or appearance at will.
prothallium a tiny, flat, circular mass, bearing the sexual organs on the underside, that is produced in the sexual generation of ferns, some mosses, and related plants.
prothrombin a protein in blood plasma that combines with calcium during clotting to form thrombin.
protium the nonradioactive, most common isotope of hydrogen, having one proton and no neutrons in the nucleus of each atom. (Cf. deuterium, tritium.)