Assertion: uracil's structure | /r/MadeOf | a series of arches
Facets:
Source sentences:
text: 2. base - lowest support of a structure; "it was built on a base of solid rock"; "he stood at the foot of the tower" understructure, groundwork, substructure, foundation, fundament, foot bed - a foundation of earth or rock supporting a road or railroad track; "the track bed had washed away" raft foundation - a foundation (usually on soft ground) consisting of an extended layer of reinforced concrete structure, construction - a thing constructed; a complex entity constructed of many parts; "the structure consisted of a series of arches"; "she wore her hair in an amazing construction of whirls and ribbons" support - supporting structure that holds up or provides a foundation; "the statue stood on a marble support"