Just trying to be helpful. If your linguistic community spells this with a "y", I find that interesting. How did this spelling originate? The standard spelling, with -i-, comes from the Latin glagoliticus, from the South Slavic glagoljica. In English, words spelled with a -y- in similar contexts (e.g. paralytic) usually have a Greek origin. So I'm curious.
This is usually spelled Glagolitic. Also, it's not an older version of Cyrillic, but a different alphabet entirely. Cyrillic, which was based to a large degree on Greek (with some letters added from Hebrew) was invented by the followers of Cyril, and named in his honor; it was probably intended to replace Glagolitic, which was a more difficult alphabet to learn since, unlike Cyrillic, it did not correspond to Greek in any way.
adj. Belonging to or written in an uncialcursive alphabet attributed to Saint Cyril, formerly used in the writing of various Slavic languages but now limited to the Catholic liturgical books used by some communities along the Dalmatian coast; in other words, Old Cyrillic.
... whatever .. I just like the sound this word makes