Englishfor English speakers
b
Noun
—
B is the second letter of the alphabet.
"b" comes after "a" but before "c"
—
In some schools, a B is a fairly high grade.
Charles got a B in his maths test.
spectrometer
—
noun
(= mass spectrometer)
spectroscope for obtaining a mass spectrum by deflecting ions into a thin slit and measuring the ion current with an electrometer