颅顶骨内面凹陷：胎儿颅顶骨发育缺陷，颅顶骨内表面有多处凹陷- syncytioma
- syncytiotoxin
- syncytiotrophoblastk
- syncytium
- syncytoid
- syndactylia
- syndactylism
- syndactylous
- syndactylus
- syndactyly
- syndectomy
- syndelphus
- syndesis
- syndesmectomy
- syndesmectopia
- syndesmitis
- syndesmo-
- syndesmochorial
- syndesmography
- syndesmologia
- syndesmology
- syndesmoma
- syndesmo-odontoid
- syndesmopexy
- syndesmophyte