tetrode field-effect transistor

A field-effect transistor having two independent gate regions, a source region, and a drain region. (Ref. IEC 747‑8.)

NOTE 1 A substrate terminated externally and independently of other elements is considered a gate for the purposes of this definition.

NOTE 2 If no confusion is likely, the term may be abbreviated to "field-effect tetrode."

References: 

JESD24, 7/85
JESD77-B, 2/00