1869; see beam (n.). So called for its shape. I-bar is from 1890; also I-rail (1873).
-iasis
-iatric
iatro-
iatrogenic
-iatry
I-beam
Iberia
ibex
ibid.
ibis
-ible
)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}