sigmoidal
Học thuậtThân thiện
Definition
- Adjective:
- Having the shape of the letter "S" or the Greek letter sigma (ς): Describing a curve that is "S"-shaped, characterized by an initial slow increase, followed by a period of rapid growth, and then a final leveling off.
- Relating to the sigmoid flexure of the large intestine: Pertaining to the S-shaped final section of the colon that connects the descending colon to the rectum.
Usage Examples
- Describing an S-shaped curve:
- The population growth followed a sigmoidal pattern over the century.
- The data is best modeled by a sigmoidal function.
- Relating to anatomy:
- The patient underwent a sigmoidal resection to remove the tumor.
- A sigmoidal volvulus is a serious medical condition involving a twisted colon.
Advanced Usage
- In mathematics and statistics: A sigmoidal function (like the logistic function) is often used to model growth processes, probability distributions, or as an activation function in neural networks.
- The neuron's output is determined by a sigmoidal activation function.
- In biology: Describes growth curves, dose-response relationships, or the shape of certain organs.
- The enzyme's activity showed a classic sigmoidal response to increasing substrate concentration.
Variants and Related Words
- Sigmoid (adj): A more common synonym for "sigmoidal," meaning S-shaped or relating to the sigmoid colon.
- The sigmoid colon is part of the digestive system.
- Sigmoidally (adv): In a sigmoidal manner.
- The values increased sigmoidally over time.
Synonyms
- S-shaped: Having the form of the letter S.
- Curvilinear: Consisting of or bounded by curved lines.
Related Phrases and Terms
- Sigmoid curve: The graphical representation of a sigmoidal function.
- Sigmoid colon: The specific S-shaped part of the large intestine.
- Sigmoid function: A mathematical function having an "S"-shaped curve.
Adjective
- of or relating to the sigmoid flexure in the large intestine