Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
tonsūra, ae, f. [tondeo], a shearing, clipping; a pruning, trimming: quidam in anno bis tondent (oves) ac semestres faciunt tonsuras, wool-shearings, shearings, Varr. R. R. 2, 11, 8: primae lana, Plin. 28, 8, 29, § 115: capillorum, Ov. A. A. 1, 517: vitis, Plin. 17, 27, 45, § 257; 16, 37, 68, § 175.