Englishfor English speakers
pyridyl
noun
—
(chemistry) Any of three isomeric univalent radicals, C5H4N-, derived from pyridine; analogous to phenyl.
a
Determinative
—
A is used when the following word could be any of a certain type.
Compare "A book I saw on the shelf" and "The book I gave you yesterday".
a
Noun
—
A is the first letter of the alphabet.
The letter "a" comes before "b".
—
In some schools, an A is a very high grade.
Ron got an A on his earth science test.
n
Noun
—
The fourteenth (14th) letter of the alphabet.
"n" comes after "m" and before "o"