13-Letter Words Containing: _,A,B,I,O,O,R,R

• Any branching, treelike shape or formation.

• The formation of such a shape or formation.

• A fibroblastic sarcoma: a malignant tumor derived from fibrous connective tissue

• serving to support or corroborate

• of or relating to the Carboniferous geologic era

• relating to or consisting of or yielding carbon

• the period from 345 million to 280 million years ago

• tumor of the fibrous covering of a peripheral nerve

• establish or strengthen as with new evidence or facts

• give evidence for

• support with evidence or authority or make more certain or confirm

• a building designed and equipped to observe astronomical phenomena

• a structure commanding a wide view of its surroundings

• confirmation that some fact or statement is true through the use of documentary evidence