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apology an expression of regret, as for an error or offense. [2 definitions]
apomorphine a white crystalline alkaloid made from morphine, used as an expectorant and emetic.
apophthegm variant of apothegm.
apoplectic of, relating to, or predisposed to apoplexy. [3 definitions]
apoplexy the sudden loss of the ability to feel or move, caused by a rupture or obstruction of an artery in the brain; stroke.
aport on or toward the left or port side of a vessel.
apostasy abandonment of one's religion, principles, loyalties, or the like.
apostate a person who abandons his or her religious faith, principles, cause, or the like. [2 definitions]
apostatize to become apostate.
a posteriori proceeding from effect to cause or from observed particular instances to a generalization; inductive. (Cf. a priori.) [2 definitions]
apostle (sometimes cap.) one of the twelve disciples of Jesus Christ who were sent forth to spread his teachings. [3 definitions]
Apostles' Creed a profession of faith in Christianity that is popularly attributed to Jesus Christ's apostles and often spoken as part of some worship services.
apostolate the office, duties, mission, or term of activity of an apostle, or, esp., of the pope as head of the Apostolic See in the Roman Catholic Church.
apostolic having to do with Jesus Christ's apostles or their teachings. [2 definitions]
Apostolic See the pope's see or center of authority, believed to have been founded at Rome by Peter.
apostolic succession a doctrine of certain Christian faiths that their bishops are the successors in an unbroken line to the apostles of Jesus Christ.
apostrophe1 a mark (') used to show the omission of one or more letters or numbers from a word or figure, as in "wouldn't" for "would not" and "'87" for "1987". [3 definitions]
apostrophe2 esp. in drama, an address to someone absent or imaginary, or to an object or idea.
apostrophize to address (a person, usu. absent, or a personified object or idea). [2 definitions]
apothecaries' measure a system of fluid measure used to dispense liquid drugs.
apothecaries' weight a system of weights used to dispense drugs.