A metal alloy used in making types for traditional typefounding and mechanical typesetting. It consists essentially of lead and antimony, often with a little tin, nickel, or copper.

(construction) finely graded iron particles combined with an oxidizing catalyst. When mixed with water (or water, cement and sand), the finely distributed particles expand, creating a waterproof layer that becomes part of the surface to which it is applied.

(roofing) A device that contains a radioactive source to emit high velocity neutrons into a roof system. Reflecting neutrons are measured by a gauge that is used to detect hydrogen; the quantity of hydrogen detected may be linked to the pressure of water.

An indicator used to measure the strength of the radio signal, often provided on communications receivers.

Any tin- or lead-based alloy. / (UK, auctions) Silver that cannot be labeled as silver in the UK because it does not bear an Assay Office mark. / Any silvery or whitish metal or alloy.

plural of metal halide lamp

plural of methane hydrate

plural of methane clathrate

(astronomy) Any very large-scale organized collection of galaxies.

A device used to measure the volume of water usage. / A device used to measure evaporation.