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hagfish

(Encyclopedia)hagfish, primitive, jawless marine fish of the family Myxinidae, of worldwide distribution in cold and temperate waters. Its rudimentary skeleton, of cartilage rather than bone, has a braincase, but n...

feminism

(Encyclopedia)feminism, movement for the political, social, and educational equality of women with men; the movement has occurred mainly in Europe and the United States. It has its roots in the humanism of the 18th...

Mead, Margaret

(Encyclopedia)Mead, Margaret, 1901–78, American anthropologist, b. Philadelphia, grad. Barnard, 1923, Ph.D. Columbia, 1929. In 1926 she became assistant curator, in 1942 associate curator, and from 1964 to 1969 s...

Monroe, Marilyn

(Encyclopedia)Monroe, Marilyn, 1926–62, American movie actress, b. Los Angeles as Norma Jean Baker or Norma Jeane Mortenson. Raised in orphanages after 1935 and first married at 14, Monroe, who began her career a...

Kony, Joseph Rao

(Encyclopedia)Kony, Joseph Rao, 1964?–, Ugandan rebel and war criminal. His cousin, Alice Lakwena, led the Holy Spirit Movement against (1986–87) Uganda's President Museveni, and when she was defeated, Kony for...

Title IX

(Encyclopedia)Title IX, clause of the Educational Amendments of 1972 that reads: “No person in the United States shall, on the basis of sex, be excluded from participation in, be denied the benefits of, or be sub...

conjoined twins

(Encyclopedia)conjoined twins, congenitally united organisms that are complete or nearly complete individuals, historically known as Siamese twins. They develop from a single fertilized ovum that has divided imperf...

crossing over

(Encyclopedia)crossing over, process in genetics by which the two chromosomes of a homologous pair exchange equal segments with each other. Crossing over occurs in the first division of meiosis. At that stage each ...

progesterone

(Encyclopedia)progesterone prōjĕsˈtərōnˌ [key], female sex hormone that induces secretory changes in the lining of the uterus essential for successful implantation of a fertilized egg. A steroid, progesterone...

Wolf, Markus Johannes

(Encyclopedia)Wolf, Markus Johannes vôlf [key], 1923–2006, East German spymaster. A legendary cold-war espionage chief, he was called “the man without a face” because until 1978 there was no known photograp...