sireniform fetus
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sirenomelus — si·re·nom·e·lus .sī rə näm ə ləs n, pl li .lī an individual exhibiting sirenomelia * * * si·ren·om·e·lus (si″rən omґə ləs) a fetus with apodal symmelia; called also apus, sympus apus, and sireniform fetus … Medical dictionary