An ion selective electrode used to measure the concentration of potassium ions, especially in biological fluids.

(chemistry, physics) An electrode whose potential is dependent on the concentration of a specific ion in the solution in which it is immersed.

A process in modelbuilding, in which bulky and/or repetitious elements of the prototype being modeled are omitted, in order to capture the important details in a smaller-than-scale model.

Working for oneself, rather than for an employer.

Eponymously named; having the same name as the author or artist.

Possessing self-control; having mastery of one's own desires.

(mathematics) Adjoint to itself. / (functional analysis) Being a Hilbert space operator which is Hermitian and also whose eigenvectors span the entire Hilbert space.

The act of keeping oneself in the background, as in humility.

A sales technique of pressuring the potential buyer to agree to a purchase. / A sales transaction which is challenging for the sales person to make; any act or object of persuasion which is challenging.

A sales technique which is quietly persuasive and subtle, seeking to convince the buyer without being forceful.