(chemistry, of an acid) containing eight replaceable hydrogen atoms / (chemistry, of a salt) having eight atoms of a univalent metal

(meteorology) The proportion of the sky that is obscured by clouds, in eighths (one octa means that one eighth of the sky is obscured, two octas that one quarter is obscured, and so on).

plural of octachoron

plural of octachoron

(mathematics) A four-dimensional object analogous to a cube, constructed out of eight cubes.

plural of octabromide

(organic chemistry) Any octabromo derivative of a porphyrin, some of which may be used in the spectrophotometric determination of lithium

(organic chemistry, in combination) Eight bromine atoms in a molecule