Pronunciation spelling of how do you do.

A runic letter or character.

(organic chemistry) The divalent radical CH₃-CH₂-CH< analogous to ethylidene; propylidene / (organic chemistry) The pesticide butan-2-yl 2-(2-hydroxyethyl)piperidine-1-carboxylate

Third-person singular simple present indicative form of spell things out