A California toadfish (Porichthys porosissimus), noted for the humming sound it produces during the breeding season.

A flame, as of hydrogen or coal gas, burning within a tube and so adjusted as to set the air within the tube in vibration, causing sound; a chemical harmonicon.

Alternative letter-case form of sinology

(software, object-oriented programming) A creational design pattern that restricts the instantiation of a class to one object.

plural of singleton pattern

(of a horse) Having the sinews under the belly shrunk by excessive fatigue.

Used other than figuratively or idiomatically: see kitchen, sink. A sink in a kitchen used for washing dishes and preparing food.

(linear algebra) A square matrix which is not invertible.

(informal, Australia) Sphagneticola trilobata, a ground-covering weed.

(organic chemistry) Having only a single chain of carbon atoms.