9 letters · 14 points in Scrabble
adjective confined to bed (by illness)
originFrom Middle English bedredyn, bedraden, bedreden, bæddrædæn (also as bedreede, bedrede), from Old English bedreda (“bedridden”, adj.), from bedreda, bedrida, bæddryda (“one who is bedridden”, noun), from bed, bedd (“bed”) + rida (“rider”), with -en by analogy with past participle adjectives.
Etymology from Wiktionary, CC BY-SA 3.0