1867 in chemistry; 1874 in medicine, "act or practice of administering medication in doses," especially in reference to the size; see dose + -age, perhaps on model of French dosage (1812).
dormouse
Dorothy
dorsal
dory
DOS
dosage
dose
do-si-do
dossier
dot
dotage
)window.location='https://www.paypal.com/cgi-bin/webscr?cmd=_donations&business=byronic106@yahoo.com&lc=US&item_name=Donation+to +Help+Keep+Etymonline+Free+and+Open&no_note=0&cn=&curency_code=USD&bn=PP-DonationsBF:btn_donateCC_LG.gif:NonHosted'){kind=link}