(physics) A stable isotope, ¹¹₅B, having five protons and six neutrons, that makes up about 80% of natural boron.

(physics) A stable isotope, ¹⁰₅B, having five protons and five neutrons, that makes up about 20% of natural boron; it is a good absorber of slow neutrons and is used as a radiation shield in Geiger counters

(physics) The only stable isotope of fluorine, ¹⁹₉F; it has nine protons and ten neutrons

Under the Whyte notation system, a steam locomotive that has two leading wheels, five pairs of coupled driving wheels, and two trailing wheels.

plural of 2-10-2

Under the Whyte notation system, a steam locomotive, with five axles connecting ten powered driving wheels, and no leading wheels or trailing wheels.

plural of 0-10-0

plural of 4-10-2

(biochemistry, steroids) Alternative form of deoxycorticosterone.

(organic chemistry) The common name for undecylenic acid.