• (a.) Of or pertaining to the three great splanchnic cavities, namely, that of the head, the chest, and the abdomen; -- applied to the sympathetic nervous system.
(tri-splangk´nik) pertaining to the three great visceral cavities, the skull, thorax, and abdomen.
Type: Term Pronunciation: trī-splangk′nik Definitions: 1. Relating to the three visceral cavities: skull, thorax, and abdomen.