Ethyl \Eth"yl\, n. [Ether + -yl.]

(Chem.) A monatomic, hydrocarbon radical, C2H5 of the paraffin series, forming the essential radical of ethane, and of common alcohol and ether.

Ethyl aldehyde. (Chem.) See Aldehyde.

Source: Webster's Revised Unabridged Dictionary (1913)