The "full name" of tea, in a scientific context, is Camellia sinensis.
While not a "full name" in the human sense, Camellia sinensis is the binomial nomenclature, or scientific name, used to identify the plant from which most tea is derived. This system, developed by Carl Linnaeus, uses two terms: the genus (Camellia) and the specific epithet (sinensis).
Different varieties and cultivars of Camellia sinensis exist, such as Camellia sinensis assamica, which is primarily grown in the Assam region of India and known for its strong, malty flavor. However, the base species remains Camellia sinensis. Therefore, to clarify, "tea" doesn't have a typical full name, but its scientific designation is Camellia sinensis.