ystum

Old English

Noun

ȳstum

1. dative plural of ȳst

Welsh

Etymology

From Middle Welsh ystum, from Proto-Celtic *tou(x)sman (“bend, arch, curve”). Cognate with Irish tuaim (“tumulus”).

Pronunciation

• (North Wales, standard) IPA^(key): /ˈəstɨm/
• (South Wales, standard) IPA^(key): /ˈəstɪm/

Noun

ystum m or f (plural ystumiau)

1. gesture, posture, pose

   Synonyms: amnaid, arwydd, osgo

2. form, shape
3. turning, curve, meander

   Synonyms: osgo, tro

4. (in the plural) grimace

Derived terms

• ystumddrwg (“wily, scheming”)
• ystumgar (“flexible, pliant”)
• ystumio (“distort; meander”)
• ystumiog (“distorted, misshapen”)
• ystumllyn (“oxbow lake”)

Related terms

• Oystermouth

Further reading

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