synaeresis /sin-ēˈrə-sis/

1. The running together of two vowels into one or into a diphthong (phonetics)
2. The spontaneous expulsion of liquid from a gel (chem)

• muddying
• muddy-mettled
• muddy the waters
• mud engineer
• mud engineers
• mudfish
• mudfishes
• mudflap
• mudflaps
• mudflat
• mudflats
• mudflow
• mudflows
• mudge
• mudged
• mudger
• mudgers
• mudges
• mudging
• mudguard
• mudguards
• mud hen
• pye-dogs
• pyeing
• pyelitic