prophylactic

pro-,提前，-phlact,看护，保护，词源同phylactery.后用于医学用语预防的。

prophylactic

prophylactic: [16] Prophylactic comes from Greek prophulaktikós, a derivative of the verb prophulássein. This meant literally ‘keep guard in front of a place’, and hence ‘take precautions against’. It was formed from the prefix pro- ‘before’ and phulássein ‘guard’.

prophylactic (adj.)

1570s, originally of medicines, "that tends to prevent disease," from Middle French prophylactique (16c.) and directly as a Latinized borrowing of Greek prophylaktikos "precautionary," from prophylassein "keep guard before, ward off, be on one's guard," from pro- "before" (see pro-) + phylassein, Ionic variant of phylattein "to watch over, to guard," but also "cherish, keep, remain in, preserve" (see phylactery).

The noun is first recorded 1640s, "a medicine or treatment to prevent disease;" meaning "condom" is from 1943, replacing earlier preventive (1822), preventative (1901). Condoms originally were used more to thwart contagious disease than to prevent pregnancy.

1. Vaccination and other prophylactic measures can be carried out.

可以采取疫苗接种和其他预防措施。

2. The region began to use quinine successfully as a prophylactic.

该地区开始成功地用奎宁作为预防剂。

3. Prophylactic antibiotics are definitely contraindicated.

预防性的使用抗菌素肯定是禁忌的.

4. Can the how long after prophylactic of out of service be pregnant?

停用避孕药后多长时间可以怀孕?

5. Prophylactic filtering operation may have benefit on preventing development of secondary glaucoma.

此外,早期作预防性滤过手术或可避免青光眼的产生.