Phrases starting with the letter: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Previous word: underclassman
Next word: underclothes
Definition of: underclay
(un′dər·klā′) noun
A layer of clay underlying a coal seam, often containing the roots of ancient coal–forming plants: also called seatstone.
Comment about this word, ask questions, or add new information about this topic: