single bond
chem. A chemical bond in which one pair of electrons is shared between two atoms. རྡུལ་ཕྲན་གཉིས་ཀྱིས་གློག་རྡུལ་ཆ་གཅིག་མཉམ་སྤྱོད་བྱས་པ་ལས་གྲུབ་པའི་རྫས་སྦྱོར་འཆིང་བ་ཞིག
singularity
phys. A mathematical point at which space and time are infinitely distorted. Calculations predict that every black hole must contain a singularity: matter falling into a black hole will ultimately […]
sinoatrial node
biol. A small body of specialized muscle tissue in the wall of the right atrium of the heart that acts as a pacemaker by producing a contractile signal at regular […]