sefydlyn

Welsh

Etymology 1

From sefydlu (“to establish”) +‎ -yn.

Noun

sefydlyn m (plural sefydlynnau, not mutable)

1. fixative
2. (mathematics) invariant function

Etymology 2

From sefydlu (“to establish”) +‎ llyn (“lake, pool”).

Alternative forms

• safydlyn

Noun

sefydlyn m (plural sefydlynnau, not mutable)

1. stagnant pool, stagnant water

   Synonyms: merllyn, merddwr

Further reading

• D. G. Lewis, N. Lewis, editors (2005–present), “sefydlyn”, in Gweiadur: the Welsh-English Dictionary, Gwerin
• R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke et al., editors (1950–present), “sefydlyn”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies