aposeleniumThe point of a body's elliptical orbit about the moon's centre of mass where the distance between the body and the centre of mass is at its maximum.
aposematicThat serves as a warning to predators, as of toxicity, especially falsely.
apostilba unit of luminance, being the luminance of a perfectly diffusing surface emitting light at the rate of ¹⁄_π candela per square metre. Also known as a blondel.
apostilleA special certification established in 1961 for certifying foreign documents.
apostleA missionary, or leader of a religious mission, especially one in the early Christian Church (but see Apostle).
apostlebirdA gregarious gray and brown bird native to Australia, Struthidea cinerea
ApostoliciAny of various Christian heretics whose common doctrinal feature was an ascetic rigidity of morals, which made them reject property and marriage.
apostolicismThe quality of being apostolical; apostolicity.
apostolicityThe quality of being apostolic, notably of preserving authenticity within the mission and tradition of the Christian church as founded by Jesus Christ and his twelve original Apostles, through their representatives and successors in the papacy and episcopate.
apostolicnessThe state or quality of being apostolic.
apostrophizeTo deliver an apostrophe (a speech, typically exclamatory) to someone, especially someone not present in person as a participant in the conversation, even someone imaginary.
aposyndeticHaving the property that for all points x distinct from a specified point p, there is a compact connected neighborhood of p that does not include x.
apotemnophobiaA fear of amputation (afraid that one will lose appendages), fear of amputations (fear of amputations on others), fear of amputees (persons with amputations).
apothecarySynonym of pharmacist: a person who sells medicine, especially (historical) one who made and sold their own medicines in the medieval or early modern eras.
apothecaryshipThe state or period of working as an apothecary.
apotheciumA type of fructification of some ascomycete fungi, forming cyst structures of various shapes. Often the fungal components of lichens have this sort of fertile structure.
apothegmA short, witty, instructive saying; an aphorism or maxim.
apothegmaticRelating to, or in the manner of, an apothegm; sententious; pithy.
apothegmaticalRelating to, or in the manner of, an apothegm; sententious; pithy.
apothesisA place on the south side of the chancel in primitive churches, furnished with shelves, for books, vestments, etc.
apothisexualBeing on the asexual spectrum and being repulsed by sexual acts.
apothisexualityThe state of being apothisexual; a sexuality on the asexual spectrum in which an individual feels repulsion towards sex or sexual acts.
apotomeThe difference between two quantities or lengths commensurable only in power, as between 1 and the square root of 2, or between the diagonal and side of a square.
apoxyomenosA conventional subject of ancient Greek votive sculpture: an athlete caught in the familiar act of scraping sweat and dust from his body with a strigil.