Rule one: Terms that end in "a", for plural add an "e". Example: vertebra (singular), (plural) vertebrae Rule Two: Terms that end in "is", for plural change it to "es". Example: diagnosis (singular),...

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Extracted text: Rule one: Terms that end in "a", for plural add an "e". Example: vertebra (singular), (plural) vertebrae Rule Two: Terms that end in "is", for plural change it to "es". Example: diagnosis (singular), (plural) Rule Three: Terms that end in "ex" or "ix" for plural replace with "ices". Example: cervix (singular), plural) Rule Four: Terms that end in "on" for plural replace it with "a". Example: criterion (singular), (plural) Rule Five: Terms that end in "um" for plural replace it with "a". Example: bacterium (singular), plural) Rule Six: Terms that end in "us" for plural replace it with "i". Example: bronchus (singular), (plural) Rule Seven: Terms that end in "itis" for plural replace it with "itides". Example: arthritis (singular), (plural) Rule Eight: Terms that end in "nx" for plural replace it with "nges". Example: phalanx (singular), (plural) Rule Nine: Terms that end in "y" for plural replace it with "ies". Example: therapy (singular), (plural) Rule Ten: Terms that end in "x" for plural replace it with "ces". Example: thorax (singular), (plural)