| pyrena | Origin: NL, fr. Gr, the stone of fruit. <botany> A nutlet resembling a seed, or the kernel of a drupe. Source: Websters Dictionary (01 Mar 1998) |
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| pyrenaemia | A condition characterised by the presence of nucleated red blood cells. Origin: G. Pyren, the pit of a fruit, + haima, blood (05 Mar 2000) |