unionserth

Welsh

Etymology

uniawn (“straight, upright”) +‎ serth (“steep”).

Adjective

unionserth (feminine singular unionserth, plural unionserth, not comparable)

1. perpendicular

   Synonym: perpendicwlar

2. vertical

   Synonyms: fertigol, uwchbennol, unionsyth

3. very steep

Further reading

• R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke et al., editors (1950–present), “unionserth”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies