候风地动仪 (候風地動儀) hòufēngdìdòngyí

hòufēngdìdòngyí noun seismograph
Domain: History 历史 , Subdomain: China
Notes: The world's first seismograph invented by Zhang Heng 张衡 in 132 (CC-CEDICT '候風地動儀'; Guoyu '候風地動儀'; Wikipedia '候風地動儀')