A borough of Alaska, United States, the equivalent of a county in other US states. Its borough seat is in Soldotna.

(tennis) The awarding of a point for a player's opponent, as a result of infringement of the rules, e.g. foul language or time violation

plural of penetrating oil

Very low-viscosity oil.

An obsolete device for measuring a bullet's momentum, from which it is possible to calculate the velocity and kinetic energy.

A pendulum constructed so that its rod is not altered in length by changes of temperature.

A kind of flat steel wire for clock pendulums.

A pendulum for carrying from station to station to be oscillated at each, so as to fix the relative acceleration of gravity.

A small opened container for stationery such as pencils, ballpoint pens, rubber, correction fluid, etc.

An artist's brush made from a few fine hairs. / (zoology) A pheromone signalling structure found in lepidopteran males.