Definition of cloaca in English:

cloaca

nounPlural cloacae kləʊˈeɪkəkloʊˈeɪkə

1Zoology
A common cavity at the end of the digestive tract for the release of both excretory and genital products in vertebrates (except most mammals) and certain invertebrates.
〔动〕泄殖腔
Example sentencesExamples
- Instead, males deposit spermatophores on the substrate and females pick up these spermatophores with their cloaca later.
- Unlike we humans, the chicken has a single sexual and excretory orifice, the cloaca.
- The bursa of Fabricius is an organ located just beside the cloaca.
- After males deposit spermatophores onto the cloaca of females, up to 150 eggs are laid on mud near water.
- Salamanders were measured from the tip of the snout to the anterior end of the cloaca.
2archaic A sewer.
〈古〉下水道，排水道，阴沟
Example sentencesExamples
- The cloaca maxima was the sewer system built in the sixth or seventh century BC, by one of the kings of Rome.

Derivatives

cloacal

adjective

Bird penile tissue, where it exists, also develops on the ventral cloacal wall.
Example sentencesExamples
- Little is known of their reproductive biology, but the lack of both spermatheca in females, and cloacal glands in males, suggests external fertilization.
- But most birds and Sphenodon lack intromittent organs and transfer sperm by cloacal apposition.
- Birds were mist-netted or caught in seed-baited traps and sexed by examination of the cloacal protuberance.
- A current theory is that the eggs are ovulated through the cloacal pore and are expelled under pressure by muscular contractions.

Origin

Late 16th century (in the sense 'sewer'): from Latin, related to cluere 'cleanse'. The first sense dates from the mid 19th century.

Definition of cloaca in US English:

cloaca

nounklōˈākəkloʊˈeɪkə

Zoology

1A common cavity at the end of the digestive tract for the release of both excretory and genital products in vertebrates (except most mammals) and certain invertebrates. Specifically, the cloaca is present in birds, reptiles, amphibians, most fish, and monotremes.
〔动〕泄殖腔
Example sentencesExamples
- After males deposit spermatophores onto the cloaca of females, up to 150 eggs are laid on mud near water.
- Unlike we humans, the chicken has a single sexual and excretory orifice, the cloaca.
- Instead, males deposit spermatophores on the substrate and females pick up these spermatophores with their cloaca later.
- The bursa of Fabricius is an organ located just beside the cloaca.
- Salamanders were measured from the tip of the snout to the anterior end of the cloaca.
1. 1.1archaic A sewer.
  〈古〉下水道，排水道，阴沟
  Example sentencesExamples
  The cloaca maxima was the sewer system built in the sixth or seventh century BC, by one of the kings of Rome.

Origin

Late 16th century (in the sense ‘sewer’): from Latin, related to cluere ‘cleanse’. The first sense dates from the mid 19th century.

单词	cloaca
释义	Definition of cloaca in English: cloaca nounPlural cloacae kləʊˈeɪkəkloʊˈeɪkə 1Zoology A common cavity at the end of the digestive tract for the release of both excretory and genital products in vertebrates (except most mammals) and certain invertebrates. 〔动〕泄殖腔 Example sentencesExamples Instead, males deposit spermatophores on the substrate and females pick up these spermatophores with their cloaca later. Unlike we humans, the chicken has a single sexual and excretory orifice, the cloaca. The bursa of Fabricius is an organ located just beside the cloaca. After males deposit spermatophores onto the cloaca of females, up to 150 eggs are laid on mud near water. Salamanders were measured from the tip of the snout to the anterior end of the cloaca. 2archaic A sewer. 〈古〉下水道，排水道，阴沟 Example sentencesExamples The cloaca maxima was the sewer system built in the sixth or seventh century BC, by one of the kings of Rome. Derivatives cloacal adjective Bird penile tissue, where it exists, also develops on the ventral cloacal wall. Example sentencesExamples Little is known of their reproductive biology, but the lack of both spermatheca in females, and cloacal glands in males, suggests external fertilization. But most birds and Sphenodon lack intromittent organs and transfer sperm by cloacal apposition. Birds were mist-netted or caught in seed-baited traps and sexed by examination of the cloacal protuberance. A current theory is that the eggs are ovulated through the cloacal pore and are expelled under pressure by muscular contractions. Origin Late 16th century (in the sense 'sewer'): from Latin, related to cluere 'cleanse'. The first sense dates from the mid 19th century. Definition of cloaca in US English: cloaca nounklōˈākəkloʊˈeɪkə Zoology 1A common cavity at the end of the digestive tract for the release of both excretory and genital products in vertebrates (except most mammals) and certain invertebrates. Specifically, the cloaca is present in birds, reptiles, amphibians, most fish, and monotremes. 〔动〕泄殖腔 Example sentencesExamples After males deposit spermatophores onto the cloaca of females, up to 150 eggs are laid on mud near water. Unlike we humans, the chicken has a single sexual and excretory orifice, the cloaca. Instead, males deposit spermatophores on the substrate and females pick up these spermatophores with their cloaca later. The bursa of Fabricius is an organ located just beside the cloaca. Salamanders were measured from the tip of the snout to the anterior end of the cloaca. 1.1archaic A sewer. 〈古〉下水道，排水道，阴沟 Example sentencesExamples The cloaca maxima was the sewer system built in the sixth or seventh century BC, by one of the kings of Rome. Origin Late 16th century (in the sense ‘sewer’): from Latin, related to cluere ‘cleanse’. The first sense dates from the mid 19th century.
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