The common small spoon used especially in serving and consuming tea, coffee, and desserts.
Abbr. t. or tsp. A household cooking measure equal to 1/3 tablespoon (about 5 milliliters). See Table at measurement.
teaspoon tea·spoon (tē'sp&oomacr;n') n. Abbr. tsp., tsp A measure of about 1 fluid dram or 5 milliliters.
[tee-spoon] 
(tē'spōōn') 