oˈblongo-used in Bot. as combining form of oblongadj. in sense ‘with oblong extension’ = oblong a. 3, as oblongo-cylindrical, oblongo-elliptic, oblongo-fusiform, oblongo-lanceolate, oblongo-ovoidadjs.1775J. Jenkinson Descr. Br. Pl.Gloss., Oblongo-ovate, partly oblong, but rather more of an oval.1846Berkeley in Proc.Berw.Nat. Club II. No. 14. 191 The sporidia..are regularly oblongo-elliptic.1847W. E. Steele Field Bot. 149 Leaves oblongo-lanceolate.1871Leighton Lichenflora 37 Oblong or oblongo-ovoid.
oblongo-/ɒbˈlɒŋgəʊ/combining form. Now rare. L18.
ORIGIN: from oblong + -o-.
Botany. Forming adjectives with the sense ‘with oblong modification of another shape’, as oblongo-elliptic, oblongo-lanceolate.