dem·i·tasse 
(dĕmē-tăs′, -täs′)
(dĕmē-tăs′, -täs′)n.
1. A small cup of strong black coffee or espresso.
2. The small cup used to serve this drink.
[French demi-tasse : demi-, demi- + tasse, cup (from Old French, from Arabic ṭašt, basin, from Persian tašt, from Middle Persian; akin to Avestan tašta-, cup, bowl).]