| 释义 |
thyroxine Biochem.|θaɪəˈrɒksiːn|
Also -in.
[f. thyro- + oxy- + indole n., after the original (erroneous) description of its chemical composition: see quot. 1918.]
A hormone secreted by the thyroid gland which increases the metabolic rate and regulates growth and development in animals; tetraiodothyronine, HO·C6H2I2·O·C6H2I2·CH2CH(NH2)COOH.
1918E. C. Kendall in Endocrinology II. 90 It appeared desirable to emphasize the presence of the oxy-indol nucleus and it appeared equally desirable not to emphasize the presence of iodin. The substance was therefore named ‘Thyro-oxy-indol’, which has been shortened to ‘thyroxin’ for every-day reference to the substance. 1926C. R. Harington in Biochem. Jrnl. XX. 294 It is impossible to accept the formula proposed by Kendall, and..the constitution of thyroxine must be regarded as not proven. 1969Daily Tel. 19 Dec. 11/7 Thyroxine, given to thyroid-deficient babies and adults, saves them from cretinism and myxoedema. 1979Arms & Camp Biology xxx. 501 If the tail is removed from a tadpole and placed in a bath containing thyroxin, the white blood cells in the tail will digest it. |