407. Compounds with ac

Compounds with añc or ac. The root ac or añc makes, in combination with prepositions and other words, a considerable class of familiarly used adjectives, of quite irregular formation and inflection, in some of which it almost loses its character of root, and becomes an ending of derivation.

a. A part of these adjectives have only two stem-forms: a strong in añc (yielding an̄, from an̄ks, in nom. sing. masc.), and a weak in ac; others distinguish from the middle in ac a weakest stem in c, before which the a is contracted with a preceding i or u into ī or ū.

b. The feminine is made by adding ī to the stem-form used in the weakest cases, and is accented like them.