cymedr (“mean”, noun) +‎ -ig

• IPA^(key): /kəˈmɛdrɪɡ/

cymedrig (feminine singular cymedrig, plural cymedrig, equative mor gymedrig, comparative mwy cymedrig, superlative mwyaf cymedrig)

1. (mathematics) mean

• gwahaniaeth cymedrig (“mean difference”)
• gwyriad cymedrig (“mean deviation”)
• màs atomig cymharol cymedrig (“mean relative atomic mass”)

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