The Irish language as attested from the fourth to the seventh centuries C.E. and written in the Ogham alphabet, the predecessor of Old Irish.

plural of Portillo

Archaic form of decade (“period of ten years”). / Archaic form of decade (“group of ten”). / (music) A group of ten notes from which the consonant triads may be constructed

(inorganic chemistry) The oxide of chromium Cr₂O₃