鸡拟单口吸虫：见于北美的感染鸭和小鸡的一种吸虫- syllabize
- syllabus
- syllepsiology
- syllepsis
- sylvan
- sylvatic
- Sylvest's disease
- sylvian
- symballophone
- symbiology
- symbion
- symbionic
- symbiont
- symbiosis
- symbiote
- pseudosclerema
- pseudosclerosis
- pseudoscrotum
- pseudosmia
- pseudosolution
- pseudostoma
- pseudostrabismus
- pseudostrophanthin
- pseudostructure
- pseudothrill