‖ osteomaPath.|ɒstiːˈəʊmə| Pl. -ata. [mod.L. f. osteo- + Gr. -ωµα, as in carcinoma, etc.] A tumour composed of osseous tissue. 1847–9Todd Cycl.Anat. IV. 135/1 By osteoma we understand a growth composed of bone.1873T. H. Green Introd.Pathol. 139 Osteomata or osseous tumours.