Methyl (noun)

1. The hydrocarbon radical CH3, present in many organic compounds.
2. A functional group consisting of a carbon atom with three hydrogen atoms attached to it.

Origin:

From the latin methylum, from greek methy "wine" + -yl, a suffix used in the names of organic compounds.

Examples:

1. The methyl group is found in many organic compounds.
2. The methylene bridge is a common feature in organic chemistry.
3. The methylation process is used to modify the activity of certain genes.
4. Methyl alcohol is a toxic substance.
5. The methyl group is often found in the structure of amino acids.