sillar

noun
si·​llar | \ sēlˈyär\
plural sillares\ -​äˌrās \

Definition of sillar

: building material consisting of large blocks cut from a natural deposit (as of lava, tuff, limestone, or compact clay)

History and Etymology for sillar

Spanish, ashlar, from silla seat, chair (from Latin sella) + -ar (from Latin -aris)

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