Definition of "undercoat" []

• A coat worn beneath another coat. (noun)
• A covering of short hairs lying underneath the longer outer hairs of an animal's coat. (noun)
• A coat of sealing material applied to a surface before the outer coats, as of paint, are applied. (noun)
• The sealing material used for this purpose. (noun)
• A tarlike substance sprayed on the underside of a vehicle to prevent rusting. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "He's cute, small (20lbs), and currently moulting (ie, his undercoat is shedding in ginormous clumps), in case you're new to the blog and haven't seen pictures."
• "The best thing is that it gets all of the undercoat, which is especially important in a Lab like Connor who's got that double coat of fur."
• "As a digital artist, working from an exact middle grey 'undercoat' helps me to ensure my tones are correct, despite monitor variations."