infant

• n. 幼児; 幼い子供; 未成年者
• adj. 幼稚な; 幼稚な; 未熟な; 未成年者
• n. （幼児）人名; （英）Infant.

in-、not、non、-fan、話す、語源的にはphone、fameと同じ。

infant

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.

1. The United States ranks 20 th in its infant mortality rate.

米国は乳児死亡率で20位だった。

2.There was an infant squalling in the back of the church.

教会の後部で大きな声で泣いている赤ちゃんがいます。

3.pioneering work on infant mortality

乳児死亡率に関する探索的研究作業

4.The operation on on the new born infant was a failure.

新生児の手術は失敗した。

5.The sole survivor of the crash was an infant .

今回衝突した唯一の生存者は赤ちゃんだった。