Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† dorcas, ădis (also dorx = δόρξ; acc. pl. dorcas, m., Grat. Cyn. 200, and dorcus, i, m., = δόρκος, Edict. Diocl. 4, no. 45), f., = δορκάς, a gazelle, antelope: Antilope dorcas, Linn.; Lucr. 4, 1161; Mart. 10, 65, 13; 13, 98, 1.