meristem

American  

[mer-uh-stem] / ˈmɛr əˌstɛm /

noun

Botany.

1. embryonic tissue in plants; undifferentiated, growing, actively dividing cells.

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meristem British  

/ ˌmɛrɪstɪˈmætɪk, ˈmɛrɪˌstɛm /

noun

1. a plant tissue responsible for growth, whose cells divide and differentiate to form the tissues and organs of the plant. Meristems occur within the stem (see cambium ) and leaves and at the tips of stems and roots

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meristem Scientific  

/ mĕr′ĭ-stĕm′ /

1. Plant tissue whose cells actively divide to form new tissues that cause the plant to grow. The originally undifferentiated cells of the meristem can produce specialized cells to form the tissues of roots, leaves, and other plant parts. The meristem includes the growing tips of roots and stems (the apical meristems) and the tissue layer known as cambium.

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meristem Cultural  

1. The region on a plant where division of cells (and hence growth) occurs. Usually, meristems are found in the shoots and root tips, and places where branches meet the stem. In trees, growth occurs in the cambium — the layer just beneath the bark.

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Other Word Forms

• meristematic adjective

Etymology

Origin of meristem

1870–75; < Greek merist ( ós ) divided, distributed (equivalent to *merid-, stem of merízein to divide into parts (derivative of méris part, share) + -tos verbal adjective suffix) + -em < Greek -ēma termination of nouns denoting result of action; -eme

Example Sentences

BBM encodes a transcription factor that regulates embryonic development, while WUS encodes a transcription factor that maintains stem cell identity in the shoot apical meristem region.

From Science Daily • May 1, 2024

Cells within this area are called the apical meristem.

From Textbooks • Jan. 1, 2015

Cells akin to an apical meristem actively divide and give rise to a gametophore, consisting of a photosynthetic stem and foliage-like structures.

From Textbooks • Jan. 1, 2015

The key to continued growth and repair of plant cells is meristem.

From Textbooks • Jan. 1, 2015

It appears at first as a simple cellular papilla of meristem, upon which an indication of two lobes soon appears.

From Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 5 "Fleury, Claude" to "Foraker" by Various