breviary (en)

(noun) a book of the prayers, hymns, psalms, and readings for the canonical hours / (noun) divine office / (noun) a brief summary

eidos (grk)

meaning "form" "essence", "type" or "species" (developed in Plato's theory of forms?)

fulguration (en)

(noun) the act or process of flashing like lightning / (noun) electrodesiccation

vis a tergo (la)

a force acting from behind (used in cardiology)