† geoblastn. [after German Geoblast (1813 or earlier)] BotanyObsoleterare the shoot of a leguminous plant in which the cotyledons are retained beneath the surface of the earth following germination.Apparently only attested in dictionaries or glossaries.
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1879 A. Gray in A. Gray & G. L. Goodale Bot. Text-bk. (ed. 6) I. 413/1Geoblast, a plumule which in germination rises from underground, such as that of the Pea.