As a defender of the endangered wetlands, the biologist documented every species that depended on the fragile ecosystem.
作为濒危湿地的捍卫者，这位生物学家记录了依赖这一脆弱生态系统的每一个物种。
Security researcher Marcus Webb notes that widespread public access to source code also means that malicious actors can study it just as easily as defenders can, and that the security benefit Brooks describes depends heavily on whether enough qualified people actually take the time to review the code.
From a Cross-Text Connections question · Craft and Structure
Which choice best defines “defender”?
B — A person who protects someone or something. “defender” means a person who protects someone or something.
Which word means “a person who protects someone or something”?
D — defender. “defender” means a person who protects someone or something.
defender — a person who protects someone or something. In Chinese: 防御者，捍卫者.
defender is pronounced /dɪˈfɛndər/.
As a defender of the endangered wetlands, the biologist documented every species that depended on the fragile ecosystem. (作为濒危湿地的捍卫者，这位生物学家记录了依赖这一脆弱生态系统的每一个物种。)
protector, guardian, advocate — all close in meaning to defender (a person who protects someone or something).
attacker, assailant — each the opposite of defender (a person who protects someone or something).
Yes. defender is on the SAT Prep Basic list — the everyday academic words the SAT assumes you already have. The Digital SAT does not test vocabulary in isolation; words like this one are tested through Words in Context questions, where you choose the word that completes a passage most logically and precisely.