| let-down r. |
the ejection or release of milk from the alveoli of the breast into the ducts, caused by a combination of neurogenic and hormonal reflexes involving the hormone oxytocin and, to a lesser extent, vasopressin; called also milk ejection r. and milk let-down r.
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| lethal c. |
a chamber that may be filled with gas, for killing small animals.
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| lethal d. |
the amount of an agent, such as a toxin or radiation, that will or may be sufficient to cause death. See also median lethal d. and minimum lethal d. Called also fatal d. Cf. L+ d.
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| lethal e. |
a gene carried in the heterozygous state which, if homozygous, would be lethal, or any combination of genes which would be lethal to 100 percent of homozygotes; for example, a combination of two genes in the heterozygous state either of which in the homozygous state would have 50 per cent lethality.
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| lethal g. |
a gene the presence of which brings about the death of the organism, or permits its survival only under certain conditions; see also lethal equivalent.
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