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stem
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   Also found in: Dictionary/thesaurus, Medical, Legal, Acronyms, Encyclopedia, Wikipedia 0.02 sec.

stem

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The external anatomy of a typical flowering plant.

Main supporting axis of a plant that bears the leaves, buds, and reproductive structures; it may be simple or branched. The plant stem usually grows above ground, although some grow underground, including rhizomes, corms, rootstocks, and tubers. Stems contain a continuous vascular system that conducts water and food to and from all parts of the plant.

The point on a stem from which a leaf or leaves arise is called a node, and the space between two successive nodes is the internode. In some plants, the stem is highly modified; for example, it may form a leaf-like cladode or it may be twining (as in many climbing plants), or fleshy and swollen to store water (as in cacti and other succulents). In plants exhibiting secondary growth, the stem may become woody, forming a main trunk, as in trees, or a number of branches from ground level, as in shrubs.

stem

In musical notation, the vertical stroke attached to the heads of all notes of smaller value than a semibreve.

stem

In grammar, the part of a verb or noun that remains unchanged by tense and agreement.



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? Mentioned in ? References in periodicals archive
 
However, a new study has found brain stem anomalies that may be at fault.
Stephanie Erlich, deputy county coroner, testified she had not inspected the brain stem and ``wouldn't have seen anything anyway,'' according to the opinion.
Now, in an in vitro study using human brain stem cells, a team of German and Californian researchers shows how a specific PCB congener, PCB-118, can interrupt normal TH function and cause the premature differentiation of one type of brain cell [EHP 113:871-876].
 
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