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nurse [nurse 词源字典]: nurse: [13] The ultimate source of nurse was Latin nūtrīre (which also gave English nourish [13], nutriment [16], and nutrition [16]). This originally meant ‘suckle’ (it is related to Sanskrit snauti ‘drips, trickles’), but was later generalized to ‘feed, nourish’ and ‘look after’. Both ‘suckle’ and ‘look after’ are preserved in nurse, which comes via Old French nourice from the late Latin derivative nūtrīcia, although originally the ‘looking after’ was restricted to children: the notion of a nurse as a ‘carer for sick people’ did not emerge in English until the end of the 16th century.

The derivative nursery [16] retains its associations with children, and by extension with young plants. Late Latin nūtrītūra ‘feeding’, based on nūtrīre, gave English nurture [14].
=> nourish, nurture, nutriment, nutrition[nurse etymology, nurse origin, 英语词源]
caret (n.): "mark in writing to show where something is to be inserted," 1680s, from Latin caret "there is lacking," 3rd person singular indicative of carere "to lack" (see caste).
caste (n.): 1550s, "a race of men," from Latin castus "chaste," from castus "cut off, separated; pure" (via notion of "cut off" from faults), past participle of carere "to be cut off from" (and related to castration), from PIE *kas-to-, from root *kes- "to cut" (cognates: Latin cassus "empty, void"). Originally spelled cast in English and later often merged with cast (n.) in its secondary sense "sort, kind, style."

Application to Hindu social groups was picked up by English in India 1610s from Portuguese casta "breed, race, caste," earlier casta raça, "unmixed race," from the same Latin word. The current spelling of of the English word is from this reborrowing. Caste system is first recorded 1840.