From Wiktionary, the free dictionary
From ъ́гъл (ǎ́gǎl, “angle”) + -ен (-en, adjectival suffix).
ъ́гълен • (ǎ́gǎlen)
- (relational) angular, corner (pertaining to angles or corners)
- Synonym: ъ́глов (ǎ́glov)
- “ъгълен”, in Речник на българския език [Dictionary of the Bulgarian Language] (in Bulgarian), Chitanka, 2010
- “ъгълен”, in Български тълковен речник [Bulgarian Explanatory Dictionary] (in Bulgarian), fourth edition, Sofia: Nauka i Izkustvo, 2005, page 1088