Entry 3 senses · 2 variants Webster, 1913 Herbal /ẽrb'-əl/ · Herb·al · IPA /ˈɝbəl/ a. n. 01 a. Of or pertaining to herbs. 1. Of or pertaining to herbs. 02 n. A book containing the names and descriptions of plants. 1. A book containing the names and descriptions of plants. 2. A collection of specimens of plants, dried and preserved; a hortus siccus; an herbarium.