any one of several species of large marine gastropods belonging to the genus yetus, or cymba; a boat shell.-in addition; further; besides; over and above; still.-at the same time; by continuance from a former state; still.-up to the present time; thus far; hitherto; until now; -- and with the negative, not yet, not up to the present time; not as soon as now; as, is it time to go? not yet.  see as yet, under as, conj.-before some future time; before the end; eventually; in time.-even; -- used emphatically.-nevertheless; notwithstanding; however.