atmatertera: great-grandfatherüs grandmotherüs sister
atony: muscular weakness
atrous: jet black
attingent: touching
attuition: operation between sensation and perception
audile: person more attuned to sound than the other senses
aught: at all
aureole: radiant light around head or body of holy personage
aurigation: charioteering
auscultation: listening to sounds arising within organs
autecology: study of ecology of one species
autogenesis: spontaneous generation
autonym: a writer's real name; work published under writer's own name