The Collaborative International Dictionary of English v.0.48:
Demi-tasse \De*mi"-tasse"\, n. [F., half cup.] A small cup for, or of, black coffee. [Webster 1913 Suppl.]WordNet (r) 3.0 (2006):
demitasse n 1: small cup of strong black coffee without milk or cream [syn: cafe noir, demitasse] 2: small coffee cup; for serving black coffee