What is "ethylating"

Ethylate \Eth"y*late\ ([e^]th"[i^]l*[asl]t), v. t. [imp. & p. p. Ethylated; p. pr. & vb. n. Ethylating.] [From Ethyl.] (Chem.) To treat in such a way as to cause the introduction of one or more ethyl groups, C2H5-; as, to ethylate alcohol.

1. That serves to ethylate v

2. (present participle of ethylate English)