(mathematics) A variant of hepta-, used for multiplication with a second numerical prefix. / (chemistry) A variant of hepta-, used for substitutions of seven complex rather than simple units.

(computer hardware) A rewritable memory chip that retains its data without a power supply.

(chemistry, historical) Oxygen gas, as originally thought to be air deprived of phlogiston (“the hypothetical fiery principle formerly assumed to be a necessary constituent of combustible bodies an...

Alternative form of flea market