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sphaeroblast
sphaeroblast n. 
/ˈsfɪərə(ʊ)blast/, /ˈsfɛrəˌblæst/ Botany (see quot. 1901).
Brit. /ˈsfɪərə(ʊ)blɑːst/
, /ˈsfɪərə(ʊ)blɑːst//ˈsfɪərə(ʊ)blast/U.S. /ˈsfɪrəˌblæst/
, /ˈsfɪrəˌblæst//ˈsfɛrəˌblæst/ΚΠ
1901 H. M. Ward Dis. in Plants xxiv. 225 Woodnodules or Sphæroblasts are curious marble-like masses of wood which protrude with a covering of bark from old trunks of Beeches, etc.
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