Definition of exine in English:

exine

noun ˈɛksɪnˈɛksʌɪnˈekˌsēn

Botany

The decay-resistant outer coating of a pollen grain or spore.
Example sentencesExamples
- This study concentrates on these parameters using purified exines (sporopollenin capsules) prepared from pine pollen, which consist of a central capsule and two lateral sacci.
- Orbicules may be attached to the exine of the pollen grains.
- Short elongated elements occur on the orbicule wall, similar to those present on the pollen exine.
- The final activity of these cells is to deposit their remaining cell contents onto the developing pollen exine, with the only remaining identifiable organelles at this stage being the mitochondria.
- A few grains were seen which had shed the exine and released a circular microgametophyte, although the actual process was not observed.

Origin

Late 19th century: perhaps from ex-² 'out' + Greek is, in- 'fibre'.

Definition of exine in US English:

exine

nounˈekˌsēn

Botany

The decay-resistant outer coating of a pollen grain or spore. It typically bears a highly characteristic surface pattern that is used in palynology.
Example sentencesExamples
- Short elongated elements occur on the orbicule wall, similar to those present on the pollen exine.
- The final activity of these cells is to deposit their remaining cell contents onto the developing pollen exine, with the only remaining identifiable organelles at this stage being the mitochondria.
- Orbicules may be attached to the exine of the pollen grains.
- A few grains were seen which had shed the exine and released a circular microgametophyte, although the actual process was not observed.
- This study concentrates on these parameters using purified exines (sporopollenin capsules) prepared from pine pollen, which consist of a central capsule and two lateral sacci.

Origin

Late 19th century: perhaps from ex- ‘out’ + Greek is, in- ‘fiber’.

单词	exine
释义	Definition of exine in English: exine noun ˈɛksɪnˈɛksʌɪnˈekˌsēn Botany The decay-resistant outer coating of a pollen grain or spore. Example sentencesExamples This study concentrates on these parameters using purified exines (sporopollenin capsules) prepared from pine pollen, which consist of a central capsule and two lateral sacci. Orbicules may be attached to the exine of the pollen grains. Short elongated elements occur on the orbicule wall, similar to those present on the pollen exine. The final activity of these cells is to deposit their remaining cell contents onto the developing pollen exine, with the only remaining identifiable organelles at this stage being the mitochondria. A few grains were seen which had shed the exine and released a circular microgametophyte, although the actual process was not observed. Origin Late 19th century: perhaps from ex-² 'out' + Greek is, in- 'fibre'. Definition of exine in US English: exine nounˈekˌsēn Botany The decay-resistant outer coating of a pollen grain or spore. It typically bears a highly characteristic surface pattern that is used in palynology. Example sentencesExamples Short elongated elements occur on the orbicule wall, similar to those present on the pollen exine. The final activity of these cells is to deposit their remaining cell contents onto the developing pollen exine, with the only remaining identifiable organelles at this stage being the mitochondria. Orbicules may be attached to the exine of the pollen grains. A few grains were seen which had shed the exine and released a circular microgametophyte, although the actual process was not observed. This study concentrates on these parameters using purified exines (sporopollenin capsules) prepared from pine pollen, which consist of a central capsule and two lateral sacci. Origin Late 19th century: perhaps from ex- ‘out’ + Greek is, in- ‘fiber’.
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