1540s, from Middle French petreux, from Latin petrosus "stony," from petra "rock," from Greek petra "rock, cliff, ledge, shelf of rock, rocky ridge," of uncertain origin. Possibly from PIE root *per- "to lead, pass over," if the original meaning is "bedrock" and the notion is "what one comes through to" [Watkins].
实用例句
1. Objective : To provide anatomical basis for petrous pyramid through petrous presigmoid approach.
目的: 为经颞骨岩部乙状窦前入路颞骨岩部的磨除提供解剖依据.
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2. Objective : To explore the clinic characteristic petrous bone cholesteatoma.
目的: 探讨岩部胆脂瘤的临床特征及手术方法.
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3. Giant dermoid cyst of the petrous apex.
大熊猫皮岩尖的囊肿.
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4. Objective : To study the effect of the back wall of petrous bone on relative surgery.
目的: 了解颞骨岩部后骨板的解剖及其变异情况对颞骨相关手术的影响.
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5. Objective : To report 24 cases of petroclival tumors resected via the trans petrous combined supra - infratentorial approach.
