onlay1
/ˈənleɪ/noun
1An item of cloth, paper, etc., fixed on the surface of something, especially for decorative effect; (Bookbinding ) a thin piece of leather, etc., mounted on the cover of a book for ornamentation.
2 Dentistry. An occlusal rest extended so as to cover the whole occlusal surface of a tooth.
Origin
Late 19th century; earliest use found in The Century Dictionary. From onlay.
onlay2
/ˌɒnˈleɪ/Now rare
verb
[with object] To lay on (literal and figurative ): see to lay on.
Origin
Old English; earliest use found in Old English Martyrology. From on- + lay.