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words ending in

-a

singular: vertebra
plural: vertebrae

-ax

singular: thorax
plural: thoraces

-ex or -ix

singular: appendix
plural: appendices

-is

singular: metastasis
plural: metastases

-ma

singular: sarcoma
plural: sarcomata

-nx

singular: phalanx
plural: phalanges

-on

singular: ganglion
plural: ganglia

-us

singular: nucleus
plural: neclei

-um

singular: ovum
plural: ova

-y

singular: biopsy
plural: biopsies

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