asbestoid,a.andn.|æzˈbɛstɔɪd| [f.Gr. ἄσβεστ-ος + -oid.] A.adj. Resembling asbestos. B.n.Min. A fibrous variety of iron-manganese amphibole, also called Byssolite. 1796Kirwan Min. I. 166 Common Asbestoid. Colour, olive or leek green.Ibid. 167 Metalliform Asbestoid. Colour, grey.