wain·scot·ing /ˈweɪnskoʊtɪŋ, -skɒtɪŋ, -skətɪŋ/

1. paneling or woodwork with which rooms, hallways, etc., are wainscoted.
2. wainscots collectively.

Also, especially British , wain·scot·ting  /ˈweɪnskətɪŋ, -skɒtɪŋ/

1570–80; wainscot + -ing

wain·scot /ˈweɪnskət, -skɒt, -skoʊt/ noun, verb, -scot·ed, -scot·ing or ( especially British ) -scot·ted, -scot·ting.

1. wood, esp. oak and usually in the form of paneling, for lining interior walls.
2. the lining itself, esp. as covering the lower portion of a wall.
3. a dado, esp. of wood, lining an interior wall.
4. British . oak of superior quality and cut, imported from the Baltic countries for fine woodwork.

–verb (used with object)
5. to line the walls of (a room, hallway, etc.) with or as if with woodwork: a room wainscoted in oak.

1325–75; ME < MLG or MD wagenschot, equiv. to wagen wain + schot (< ?)

—Related forms
un·wain·scot·ed, adjective
un·wain·scot·ted, adjective

Source: Dictionary.com.

High windows, each of twelve violet panes, dimmed the afternoon sunlight; fusty magenta beams, slanting down across the room, warmed the dark oak wainscoting.

Source: Tales of the Dying Earth by Jack Vance.