late 14c., "condition of being foolish; foolish love, infatuation," literally "the condition of one who dotes," from dote (v.) + -age. Also from late 14c. as "senility; feebleness or imbecility of mind in old age."
dosage
dose
do-si-do
dossier
dot
dotage
dotard
dote
doth
dotty
Douai