AthloneA town in County Westmeath and County Roscommon, Ireland (Irish grid ref N 0441).
athlotheteAn agonothete of the Pythian games at Athens.
AthlumneyA castle in Navan, County Meath, Ireland.
athodydA simple jet engine consisting essentially of a tube with a means of delivering fuel and ignition into the tube. The engine can only be started in a fast airflow. This type of engine is expected to be able to provide cruising speeds at Mach numbers of around 5 to 7 (5 to 7 times the speed of sound).
atinumabAn immunomodulator that binds to reticulon-4.
AtiocA barangay of Tarlac City, Tarlac, Philippines.
atipamezoleA synthetic alpha2-adrenergic antagonist indicated for the reversal of the sedative and analgesic effects of dexmedetomidine and medetomidine in dogs.
AtkinsA surname transferred from the given name meaning "son of Atkin (Adam)".
AtkinsonA surname from Middle English [in turn originating as a patronymic] meaning "son of Atkin", a Middle English diminutive of Adam.
AtkinsonianOf or relating to John William Atkinson (1923–2003), American psychologist who pioneered the scientific study of human motivation, achievement, and behavior.
AtlanticaAn ancient continent that formed during the Proterozoic about 2,000 million years ago from various 2 Ga cratons located in what are now West Africa and eastern South America.
AtlanticismA philosophy of cooperation among Western European and North American nations.
atlasiteA discredited mineral, thought to be a mixture of azurite and atacamite.
atlasoviteA tetragonal-ditetragonal dipyramidal dark brown mineral with the chemical formula K(BiO)Cu₆Fe³⁺(SO₄)₅O₃Cl.
atlastinAny of a family of proteins whose function is to fuse cell membranes
atlatlA spearthrower consisting of a wooden stick with a thong or perpendicularly protruding hook on the rear end that grips a grove or socket on the butt of its accompanying spear (or dart), intended to steady the spear immediately prior to throwing, to increase its potential range when thrown, and to increase its force of penetration of the target.
atlatlistOne who uses an atlatl for hunting or for sport.
atmiatrytreatment of disease by vapours or gases, as by inhalation
atmidometerAn instrument for measuring the evaporation from water, ice, or snow.
atmidometryThe measurement of the rate of evaporation of a liquid; atmometry.
atmoThe standard atmospheric pressure used in certain physical measurements and calculations; conventionally, that pressure under which the barometer stands at 760 millimeters, at a temperature of 0° Centigrade, at the level of the sea, and in the latitude of Paris.