DADOING
Verb
dadoing
present participle of dado
Source: Wiktionary
DADO
Da"do, n.; pl. Dadoes. Etym: [It. dado die, cube, pedestal; of the
same origin as E. die, n. See Die, n.] (Arch.)
(a) That part of a pedestal included between the base and the cornice
(or surbase); the die. See Illust. of Column. Hence:
(b) In any wall, that part of the basement included between the base
and the base course. See Base course, under Base.
(c) In interior decoration, the lower part of the wall of an
apartment when adorned with moldings, or otherwise specially
decorated.
Source: Webster’s Unabridged Dictionary 1913 Edition