| Word | Definitions | Synonyms |
|---|---|---|
| tyrosinemia | (noun) autosomal recessive defect in tyrosine metabolism resulting in liver and kidney disturbances and mental retardation | - |
| tyrothricin | (noun) a mixture of antibiotics applied locally to infections caused by Gram-positive bacteria | - |
| yr | (noun) a period of time containing 365 (or 366) days | Synonyms: twelvemonth, year |
| zephyr | (noun) a slight wind (usually refreshing) | Synonyms: air, breeze, gentle wind |