infant: [14] Etymologically, an infant is ‘someone who cannot yet speak’. The word comes via Old French enfant from Latin infāns ‘young child’, a noun use of the adjective infāns, originally ‘unable to speak’, which was formed from the negative prefix in- and the present participle of fārī ‘speak’ (source of English fable, fame, fate, etc).
The somewhat improbable derivative infantry [16] comes via French from Italian infanteria; this was based on infante, whose original meaning ‘young person’ had shifted to ‘foot soldier’ (a development distantly reminiscent of the use of British English lads for ‘male members of a group, team, etc’). => fable, fame, fate
infant (n.)
late 14c., "child during earliest period of life" (sometimes extended to age 7 and sometimes including a fetus), from Latin infantem (nominative infans) "young child, babe in arms," noun use of adjective meaning "not able to speak," from in- "not, opposite of" (see in- (1)) + fans, present participle of fari "to speak," from PIE root *bha- (2) "to speak, tell, say" (see fame (n.)). As an adjective, 1580s, from the noun.
中文解释
要想婴儿长得快，将他放在（in）饭（fan）桶（t）里。
实用例句
1. The United States ranks 20th in its infant mortality rate.
美国在婴儿死亡率方面排名第20。
来自柯林斯例句
2. There was an infant squalling in the back of the church.
有个婴儿在教堂后部大声啼哭。
来自柯林斯例句
3. pioneering work on infant mortality
婴儿死亡率方面的探索性研究工作
来自《权威词典》
4. The operation on the new born infant was a failure.