| amastia | (noun) absence of the mammary glands (either through surgery or developmental defect) | - |
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| costia | (noun) a flagellate that is the cause of the frequently fatal fish disease costiasis | Synonyms: Costia necatrix |
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| gynecomastia | (noun) excessive development of the breasts in males; usually the result of hormonal imbalance or treatment with certain drugs (including some antihypertensives) | - |
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| pistia | (noun) pantropical floating plant forming a rosette of wedge-shaped leaves; a widespread weed in rivers and lakes | Synonyms: Pistia stratiotes, Pistia stratoites, water cabbage, water lettuce |
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| zooerastia | (noun) sexual activity between a person and an animal | Synonyms: bestiality, sodomy, zooerasty |
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