(chemistry, in combination) Eight atoms of copper in a chemical compound.

(organic chemistry) Any salt or ester of an octacosadienoic acid

(organic chemistry) Any salt or ester of an octacosenoic acid

(geometry) A polygon with 80 sides and 80 angles.

(organic chemistry) The toxic perchloro derivative of dibenzofuran 1,2,3,4,6,7,8,9-octachlorodibenzofuran

A species of octopus, endemic to bays and coastal waters of the tropical eastern Pacific, that has a striped body and spotted tentacles, and exhibits certain behaviours that distinguish it from other octopuses.

Relating to, or composed of eight cistrons

A theoretical molecule composed of eight (8) nitrogen atoms only, in a cubic configuration, with each nitrogen (N) atom being a vertex on the cube, and bonding to three other nitrogens at the nearest three other vertexes. This is theorized to be the high explosive with the highest velocity, the most explosive non-nuclear explosive. It is an allotrope of nitrogen, and an analogue of the organic molecule cubane; and an isomer of octanitrogen (N₈).

(organic chemistry) Any salt or ester of octacosanoic acid

plural of octachloride