A merchant ship. / A merchant flotilla, fleet. / An abundant supply, boatload.

(geology) A method of estimating the age of igneous rocks or of archaeological objects by measuring the amount of argon that has built up through the radioactive decay of potassium.

(physics) A rare stable isotope of argon, ³⁸₁₈Ar, having eighteen protons and twenty neutrons; it amounts to about 0.06% of the element in nature

(physics) The major stable isotope of argon, ⁴⁰₁₈Ar, having eighteen protons and twenty-two neutrons; it amounts to about 99.6% of the element in nature

(physics) A rare stable isotope of argon, ³⁶₁₈Ar, having eighteen protons and eighteen neutrons; it amounts to about 0.3% of the element in nature

plural of argot

plural of argonaut

(linguistics) A Ethiopian Semitic language spoken in an area north-east of Addis Ababa by the Argobba people.

(ethnology) A member of a Muslim group of traders and merchants, spread out through isolated village networks and towns in the northeast and east of Ethiopia.

(biochemistry, genetics) Any of a group of proteins responsible for the gene silencing phenomenon known as RNA interference