Bot. Pl. -idæ. Also anglicized synergid. [mod.L., f. Gr. συνεργεῖν to co-operate.] Either of two naked nucleated cells at the apex of the embryo-sac, regarded as co-operating with the oosphere in the production of the embryo.

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1882.  Vines, trans. Sachs’ Bot., 580. Two of the cells of the egg-apparatus lie nearer the apex…; they are somewhat elongated superiorly, and the nucleus lies in this elongated portion…: these cells have been termed by Strasburger the Synergidæ. Ibid. In Sinningia, according to Strasburger, only one synergida is present in some cases.

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1898.  Natural Science, June, 375. Origin of the embryos from egg-cell, synergids, antipodal cells, or nucellus.

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  Hence Synergidal a.

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In recent Dicts.

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