プログレッシブ和英中辞典(第4版)の解説
りょういん【両院】
「the two [both] Houses；《米》 the House (of Representatives) and the Senate, both Houses of Congress
法案は両院とも通過した
The bill passed both Houses.
両院協議会
a joint committee (of the two Houses)；《米》 a conference committee (of the House and the Senate)