cog

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cog / käg/ • n. a wheel or bar with a series of projections on its edge that transfers motion by engaging with projections on another wheel or bar: fig. she was only a very small cog in a big machine. ∎  each of such a series of projections.DERIVATIVES: cogged adj.

cog

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cog.
1. Projection or tenon at the end of a beam received into a corresponding notch or mortice in another beam. A cog-hold is therefore a connection using a cog.

2. Brick projecting and laid diagonally. See cogging

cog

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cog projecting tooth on a wheel. XIII. ME. cogge, of unkn. orig but prob. Scand. (cf. synon. Sw. kugge, kughjul cog-wheel, Norw. kug).