trōˈmäməd.ə(r) noun
Etymology: Greek tromo s trembling (akin to Greek tremein to tremble) + English -meter — more at tremble
: an instrument for measuring or detecting minute earth tremors
• trom·o·met·ric |tramə|me.trik or trom·o·met·ri·cal -rə̇kəl adjective
• tro·mom·e·try trōˈmämə.trē noun -es