From The Collaborative International Dictionary of English v.0.48:
Cruet \Cru"et\ (kr[udd]"[e^]t), n. [Anglo-French cruet, a dim.
from OF. crue, cruie; of German or Celtic origin, and akin to
E. crock an earthen vessel.]
1. A bottle or vessel; esp., a vial or small glass bottle for
holding vinegar, oil, pepper, or the like, for the table;
a caster. --Swift.
[1913 Webster]
2. (Eccl.) A vessel used to hold wine, oil, or water for the
service of the altar.
[1913 Webster] cruet-stand