Definition of velamen in English:

velamen

nounPlural velamina vɪˈleɪmənvəˈlāmən

Botany

An outer layer of empty cells in the aerial roots of epiphytic orchids and aroids.
〔植〕根被
Example sentencesExamples
- Orchid roots are covered with a special tissue called velamen occurring only in a very few non-orchid plant families.
- The role of the velamen is to absorb moisture from the ambient atmosphere, and, may be, to protect from cold or heat.
- Over watering turns the velamen brown and mushy and the roots lose their ability to absorb water.
- When water is in short supply, the dry velamen restricts water loss from the roots.
- While dry, the velamen may provide a barrier to water loss via transpiration from the wet, internal cells of the root.

Origin

Late 19th century: from Latin, from velare 'to cover'.

Definition of velamen in US English:

velamen

nounvəˈlāmən

Botany

An outer layer of empty cells in the aerial roots of epiphytic orchids and aroids.
〔植〕根被
Example sentencesExamples
- When water is in short supply, the dry velamen restricts water loss from the roots.
- The role of the velamen is to absorb moisture from the ambient atmosphere, and, may be, to protect from cold or heat.
- Over watering turns the velamen brown and mushy and the roots lose their ability to absorb water.
- While dry, the velamen may provide a barrier to water loss via transpiration from the wet, internal cells of the root.
- Orchid roots are covered with a special tissue called velamen occurring only in a very few non-orchid plant families.

Origin

Late 19th century: from Latin, from velare ‘to cover’.

词汇	velamen
释义	Definition of velamen in English: velamen nounPlural velamina vɪˈleɪmənvəˈlāmən Botany An outer layer of empty cells in the aerial roots of epiphytic orchids and aroids. 〔植〕根被 Example sentencesExamples Orchid roots are covered with a special tissue called velamen occurring only in a very few non-orchid plant families. The role of the velamen is to absorb moisture from the ambient atmosphere, and, may be, to protect from cold or heat. Over watering turns the velamen brown and mushy and the roots lose their ability to absorb water. When water is in short supply, the dry velamen restricts water loss from the roots. While dry, the velamen may provide a barrier to water loss via transpiration from the wet, internal cells of the root. Origin Late 19th century: from Latin, from velare 'to cover'. Definition of velamen in US English: velamen nounvəˈlāmən Botany An outer layer of empty cells in the aerial roots of epiphytic orchids and aroids. 〔植〕根被 Example sentencesExamples When water is in short supply, the dry velamen restricts water loss from the roots. The role of the velamen is to absorb moisture from the ambient atmosphere, and, may be, to protect from cold or heat. Over watering turns the velamen brown and mushy and the roots lose their ability to absorb water. While dry, the velamen may provide a barrier to water loss via transpiration from the wet, internal cells of the root. Orchid roots are covered with a special tissue called velamen occurring only in a very few non-orchid plant families. Origin Late 19th century: from Latin, from velare ‘to cover’.
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