英语词源字典 - 在线词源网站

infant (n.)[infant 词源字典]: 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.[infant etymology, infant origin, 英语词源]
Infanta (n.): "daughter of a king of Spain or Portugal," c. 1600, from Spanish and Portuguese infanta, fem. of infante, from Latin infantem (see infant).
infanticide (n.): 1650s, "the killing of infants;" 1670s, "one who kills an infant," from infant + -cide.
infantile (adj.): mid-15c., "pertaining to infants," from Latin infantilis "pertaining to an infant," from infans (see infant). Sense of "infant-like" is from 1772.
infantilism (n.): 1894 in a psychological sense; see infantile + -ism. Earlier in a physiological sense, "retarded and imperfect physical development."
infantry (n.): 1570s, from French infantrie, from older Italian, Spanish infanteria "foot soldiers, force composed of those too inexperienced or low in rank for cavalry," from infante "foot soldier," originally "a youth," from Latin infantem (see infant). Meaning "infants collectively" is recorded from 1610s. A Middle English (c. 1200) word for "foot-soldiers" was going-folc, literally "going-folk."
infantryman (n.): 1837, from infantry + man (n.).
infarct (n.): 1873, from medical Latin infarctus (Latin infartus), past participle of infarcire "to stuff into," from in- + farcire âto stuffâ (see farce).
infarction (n.): 1680s, noun of action from Latin infarcire (see infarct).
infatigable (adj.): c. 1500, from French infatigable (15c.), from Latin infatigabilis, from in- "not, opposite of" (see in- (1)) + fatigabilis, from fatigare "to weary" (see fatigue).
infatuate (v.): 1530s, "turn (something) to foolishness, frustrate," from Latin infatuatus, past participle of infatuare "make a fool of," from in- "in" (see in- (2)) + fatuus "foolish." Specific sense of "inspire (in someone) a foolish romantic passion" is from 1620s. Related: Infatuated; infatuating.
infatuation (n.): 1640s, noun of action from infatuate, or else from French infatuation or directly from Late Latin infatuationem (nominative infatuatio), from past participle stem of infatuare.
infeasibility (n.): 1650s, from infeasible + -ity.
infeasible (adj.): 1530s, from in- (1) "not, opposite of" + feasible.
infect (v.): late 14c., from Latin infectus, past participle of inficere "to spoil, stain," literally "to put in to, dip into," from in- "in" (see in- (2)) + facere "to make, do, perform" (see factitious). Related: Infected; infecting.
infection (n.): late 14c., "infectious disease; contaminated condition;" from Old French infeccion "contamination, poisoning" (13c.) and directly from Late Latin infectionem (nominative infectio), noun of action from past participle stem of Latin inficere (see infect). Meaning "communication of disease by agency of air or water" (distinguished from contagion, which is body-to-body communication), is from 1540s.
infectious (adj.): "catching, having the quality of spreading from person to person," 1540s of diseases, 1610s of emotions, actions, etc.; see infect + -ous.
infective (adj.): late 14c., from Latin infectivus, from infectus (see infect).
infelicitous (adj.): 1754, from in- (1) "not, opposite of" + felicitous. Related: infelicitously.
infelicity (n.): late 14c., from Latin infelicitas "ill luck, misfortune," from infelix (genitive infelicis) "unfruitful, barren; unfortunate, unhappy, causing misfortune, unlucky," from in- "not, opposite of" (see in- (1)) + felix (see felicity).