Definition of monotreme in English:

monotreme

noun ˈmɒnə(ʊ)triːmˈmɑnəˌtrim

Zoology

A primitive mammal that lays large yolky eggs and has a common opening for the urogenital and digestive systems. Monotremes are now restricted to Australia and New Guinea, and comprise the platypus and the echidnas.
Order Monotremata and subclass Prototheria: two families
Example sentencesExamples
- There are only three living monotremes, the duck-billed platypus and two species of echidna, or ‘spiny anteaters’, such as the one shown at right.
- The Australian fossil record of monotremes also includes some quite good Miocene and Pleistocene fossils of giant echidnas.
- Placental and marsupial mammals are more closely related to one another than to the third living group of mammals, the monotremes.
- Many of the comprehensive, algorithm-based analyses place multituberculates within the crown group of living mammals, in some cases tentatively united with monotremes.
- Molecular evidence now suggests that the marsupials and the monotremes branched off much earlier than the placentals did and that they are therefore the closer relatives.

Origin

Mid 19th century: from mono- 'single' + Greek trēma 'hole'.

Definition of monotreme in US English:

monotreme

nounˈmɑnəˌtrimˈmänəˌtrēm

Zoology

A primitive mammal that lays large yolky eggs and has a common opening for the urogenital and digestive systems. Monotremes are now restricted to Australia and New Guinea, and comprise the platypus and the echidnas.
Order Monotremata and subclass Prototheria: two families
Example sentencesExamples
- There are only three living monotremes, the duck-billed platypus and two species of echidna, or ‘spiny anteaters’, such as the one shown at right.
- Many of the comprehensive, algorithm-based analyses place multituberculates within the crown group of living mammals, in some cases tentatively united with monotremes.
- Molecular evidence now suggests that the marsupials and the monotremes branched off much earlier than the placentals did and that they are therefore the closer relatives.
- The Australian fossil record of monotremes also includes some quite good Miocene and Pleistocene fossils of giant echidnas.
- Placental and marsupial mammals are more closely related to one another than to the third living group of mammals, the monotremes.

Origin

Mid 19th century: from mono- ‘single’ + Greek trēma ‘hole’.

单词	monotreme
释义	Definition of monotreme in English: monotreme noun ˈmɒnə(ʊ)triːmˈmɑnəˌtrim Zoology A primitive mammal that lays large yolky eggs and has a common opening for the urogenital and digestive systems. Monotremes are now restricted to Australia and New Guinea, and comprise the platypus and the echidnas. Order Monotremata and subclass Prototheria: two families Example sentencesExamples There are only three living monotremes, the duck-billed platypus and two species of echidna, or ‘spiny anteaters’, such as the one shown at right. The Australian fossil record of monotremes also includes some quite good Miocene and Pleistocene fossils of giant echidnas. Placental and marsupial mammals are more closely related to one another than to the third living group of mammals, the monotremes. Many of the comprehensive, algorithm-based analyses place multituberculates within the crown group of living mammals, in some cases tentatively united with monotremes. Molecular evidence now suggests that the marsupials and the monotremes branched off much earlier than the placentals did and that they are therefore the closer relatives. Origin Mid 19th century: from mono- 'single' + Greek trēma 'hole'. Definition of monotreme in US English: monotreme nounˈmɑnəˌtrimˈmänəˌtrēm Zoology A primitive mammal that lays large yolky eggs and has a common opening for the urogenital and digestive systems. Monotremes are now restricted to Australia and New Guinea, and comprise the platypus and the echidnas. Order Monotremata and subclass Prototheria: two families Example sentencesExamples There are only three living monotremes, the duck-billed platypus and two species of echidna, or ‘spiny anteaters’, such as the one shown at right. Many of the comprehensive, algorithm-based analyses place multituberculates within the crown group of living mammals, in some cases tentatively united with monotremes. Molecular evidence now suggests that the marsupials and the monotremes branched off much earlier than the placentals did and that they are therefore the closer relatives. The Australian fossil record of monotremes also includes some quite good Miocene and Pleistocene fossils of giant echidnas. Placental and marsupial mammals are more closely related to one another than to the third living group of mammals, the monotremes. Origin Mid 19th century: from mono- ‘single’ + Greek trēma ‘hole’.
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