i Register
In some senses, undercoat is marked as obsolete. Watch for register when choosing this word.
noun
A layer of short hairs underneath the longer ones of an animal's fur.
A coat of paint or other material applied onto a surface before that of a topcoat; sometimes, a coloured primer.
The conversion process is carried out by Progress Rail at Longport, from where they are dispatched in undercoat to Eastleigh for final painting.
A coat for wearing indoors, under an overcoat.
verb
To apply an undercoat to.