Learned borrowing from English catalytic + -ig.

• (North Wales) IPA^(key): /kataˈlɨ̞tɪɡ/
• (North Wales) IPA^(key): /kataˈlɪtɪɡ/

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

1. (chemistry) catalytic

• catalydd (“catalyst”)
• catalysis

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