the lowest sill of a structure, placed on the foundation or directly on the ground
mudsill in American English
(ˈmʌdˌsɪl)
noun
the lowest sill of a structure, usually placed in or on the ground
Also called: footplate
Word origin
[1675–85; mud + sill]This word is first recorded in the period 1675–85. Other words that entered Englishat around the same time include: hustle, prairie, stoma, surf, upstream