"in a throbbing state," 1854, from a- (1) + throb (v.). Related: Athrobbing.
athletic
athleticism
athletics
at-home
-athon
athrob
athwart
atilt
-ation
-ative
Atlantean
)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}