adj. & n.
adj. 1 of or written in majuscule writing with rounded unjoined letters found in manuscripts of the 4th-8th c., from which modern capitals are derived. 2 of or relating to an inch or an ounce.
n. 1 an uncial letter. 2 an uncial style or MS.
[ L uncialis f. uncia inch: sense 1 in LL sense of unciales litterae, the orig. application of which is unclear ]