# SAR

/ˈsɑɹ/ (US)

Source: https://englishreference.com/word/sar
Updated: 2026-08-27

## Senses

### 1. emergency services

noun · CEFR B2

Stands for Search and Rescue.

For teachers: Abbreviation for Search and Rescue. Refers to the coordinated operations to locate and assist people in distress or imminent danger.

- The coast guard launched a SAR mission to find the missing boat.
- The mountainous terrain and heavy fog significantly hampered the SAR operations, forcing the team to rely on thermal imaging.

Usage: Often used as a modifier before another noun like 'mission', 'team', or 'operation'.

### 2. political geography

noun · CEFR B2

Stands for Special Administrative Region.

For teachers: Abbreviation for Special Administrative Region. Used primarily to describe autonomous territories like Hong Kong and Macau.

- Hong Kong is a SAR that has its own legal system.
- The constitutional framework of the SAR allows for a high degree of autonomy in economic and social matters.

Usage: Usually capitalized; often follows the name of the specific territory.

### 3. finance and law

noun · CEFR C1 · Technical

Stands for Suspicious Activity Report.

For teachers: Abbreviation for Suspicious Activity Report. A document that financial institutions must file with authorities regarding potentially illegal transactions.

- The bank filed a SAR after noticing several large, unusual transfers.
- Compliance officers are required to submit a SAR whenever they detect patterns indicative of money laundering or terrorist financing.

Usage: Common in banking and anti-money laundering (AML) contexts.

### 4. radar technology

noun · CEFR C1 · Technical

Stands for Synthetic-Aperture Radar.

For teachers: Abbreviation for Synthetic-Aperture Radar. A form of radar used to create two-dimensional images or three-dimensional reconstructions of objects.

- The satellite uses SAR to take clear pictures through thick clouds.
- Unlike optical sensors, SAR provides high-resolution ground imagery regardless of lighting conditions or atmospheric interference.

### 5. biology and plants

noun · CEFR C2 · Technical

Stands for Systemic Acquired Resistance.

For teachers: Abbreviation for Systemic Acquired Resistance. A 'whole-plant' resistance response that occurs following an earlier localized exposure to a pathogen.

- The plant developed SAR after the first infection, helping it fight future attacks.
- Inducing SAR in crops is a key strategy for developing sustainable agricultural practices that reduce reliance on chemical pesticides.

### 6. pharmacology

noun · CEFR C2 · Technical

Stands for Structure-Activity Relationship.

For teachers: Abbreviation for Structure-Activity Relationship. The relationship between the chemical structure of a molecule and its biological activity.

- Scientists studied the SAR to design a more effective medicine.
- Understanding the SAR of these compounds is essential for optimizing their potency and reducing side effects during drug development.

### 7. currency

noun · CEFR B2

Stands for Saudi Arabian riyal.

For teachers: Abbreviation for Saudi Arabian riyal. The official currency of Saudi Arabia.

- The price was listed as 500 SAR on the receipt.
- The exchange rate for SAR remained stable against the dollar due to the country's fixed-peg policy.

## Examples

- The plant developed SAR after the first leaf was infected.
- Farmers use specific chemical sprays to trigger SAR in crops, helping them resist fungal diseases without using traditional pesticides.
- The induction of SAR is characterized by an increase in endogenous salicylic acid levels, which coordinates the expression of pathogenesis-related proteins to fortify the plant against subsequent biotic stress.

---

From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.