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.
〔动〕原口动物
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.
〔动〕原口动物
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. 〔动〕原口动物 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. 〔动〕原口动物 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’.
随便看	put someone's nose out of joint put someone's nose out of joint put someone/something on the map put someone/something on the map put someone/something on the scales put someone/something out of one's mind put someone/something out of one's mind put someone/something out of their misery put someone/something out of their misery put someone/something to flight put someone/something to flight put someone/something to the test put someone/something to the test put someone's (or have one's) ass in a sling put someone's pot on put someone through put someone through put someone through its paces put someone through their paces put someone through the mill put someone through the the mangle put someone through the third degree put someone through the wringer put someone through the wringer/mangle put someone through the wringer (or the mangle)