The Collaborative International Dictionary
Hyphening
Hyphen \Hy"phen\, v. t. [imp. & p. p. Hyphened; p. pr. & vb. n. Hyphening.] To connect with, or separate by, a hyphen, as two words or the parts of a word.
Wiktionary
hyphening
vb. (present participle of hyphen English)