Plural of choriama; tumors or growths of chorionic tissue (variant plural of choriomas).
From chorio- (Greek khoros 'membrane') + -ama, with Greek plural -ata. Variant medical plural following Greek rather than Latin convention.
This word shows how medical terminology mixes Greek and Latin—some tumors get Latin plurals (-omas) while others use Greek (-amata), depending on which convention doctors adopted.
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