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Definition of Subterraneous
1. Adjective. Being or operating under the surface of the earth. "A subsurface flow of water"
2. Adjective. Lying beyond what is openly revealed or avowed (especially being kept in the background or deliberately concealed). "Looked too closely for an ulterior purpose in all knowledge"
Definition of Subterraneous
1. Adjective. Subterranean. ¹
¹ Source: wiktionary.com
Definition of Subterraneous
1. [adj]