Definition of protostome in English:

protostome

noun ˈprəʊtə(ʊ)stəʊmˈprōdəˌstōm

Zoology

A multicellular organism whose mouth develops from a primary embryonic opening, such as an annelid, mollusc, or arthropod.
Example sentencesExamples
- Once this had appeared, the protostomes could develop.
- In the complementary category, the protostomes, which includes annelids and arthropods, the blastopore develops into the mouth.
- If the ancestor of protostomes displayed a segmentation comparable to annelids and arthropods, this necessarily means that segmentation was lost independently in different protostome lineages.
- Arthropods are bilaterally symmetrical protostomes with strongly segmented bodies.
- These animals are all protostomes - the mouth develops before the anus in the young embryo - and they have long been recognized as belonging together as a group.

Origin

1950s: from proto- 'primitive' + Greek stoma 'mouth'.

Definition of protostome in US English:

protostome

nounˈprōdəˌstōm

Zoology

A multicellular organism whose mouth develops from a primary embryonic opening, such as an annelid, mollusk, or arthropod.
Example sentencesExamples
- In the complementary category, the protostomes, which includes annelids and arthropods, the blastopore develops into the mouth.
- These animals are all protostomes - the mouth develops before the anus in the young embryo - and they have long been recognized as belonging together as a group.
- Arthropods are bilaterally symmetrical protostomes with strongly segmented bodies.
- If the ancestor of protostomes displayed a segmentation comparable to annelids and arthropods, this necessarily means that segmentation was lost independently in different protostome lineages.
- Once this had appeared, the protostomes could develop.

Origin

1950s: from proto- ‘primitive’ + Greek stoma ‘mouth’.

单词	protostome
释义	Definition of protostome in English: protostome noun ˈprəʊtə(ʊ)stəʊmˈprōdəˌstōm Zoology A multicellular organism whose mouth develops from a primary embryonic opening, such as an annelid, mollusc, or arthropod. Example sentencesExamples Once this had appeared, the protostomes could develop. In the complementary category, the protostomes, which includes annelids and arthropods, the blastopore develops into the mouth. If the ancestor of protostomes displayed a segmentation comparable to annelids and arthropods, this necessarily means that segmentation was lost independently in different protostome lineages. Arthropods are bilaterally symmetrical protostomes with strongly segmented bodies. These animals are all protostomes - the mouth develops before the anus in the young embryo - and they have long been recognized as belonging together as a group. Origin 1950s: from proto- 'primitive' + Greek stoma 'mouth'. Definition of protostome in US English: protostome nounˈprōdəˌstōm Zoology A multicellular organism whose mouth develops from a primary embryonic opening, such as an annelid, mollusk, or arthropod. Example sentencesExamples In the complementary category, the protostomes, which includes annelids and arthropods, the blastopore develops into the mouth. These animals are all protostomes - the mouth develops before the anus in the young embryo - and they have long been recognized as belonging together as a group. Arthropods are bilaterally symmetrical protostomes with strongly segmented bodies. If the ancestor of protostomes displayed a segmentation comparable to annelids and arthropods, this necessarily means that segmentation was lost independently in different protostome lineages. Once this had appeared, the protostomes could develop. Origin 1950s: from proto- ‘primitive’ + Greek stoma ‘mouth’.
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