wave·front 
(wāvfrŭnt′)
(wāvfrŭnt′)n.
The continuous line or surface including all the points in space reached by a wave or vibration at the same instant as it travels through a medium.
- motet
- moth
- mothball
- moth-eaten
- mother
- mother
- "Mother Ann."
- "Mother Bloor."
- motherboard
- "Mother Cabrini."
- Mother Carey's chicken
- mother cell
- mother country
- motherese
- mother figure
- motherfucker
- motherfucking
- Mother Goose
- mother hen
- motherhood
- motherhouse
- Mother Hubbard
- mothering
- mother-in-law
- "Mother Jones."