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aquarium [aquarium 词源字典]: aquarium: [19] Aquarium is a modern adaptation of the neuter form of the Latin adjective aquārius ‘watery’ (a noun aquārium existed in Roman times, but it meant ‘place where cattle drink’). Its model was vivarium, a 16th-century word for a ‘place for keeping live animals’. This was the term first pressed into service to describe such a place used for displaying fish and other aquatic life: in 1853 the magazine Athenaeum reported that ‘the new Fish house at the London Zoo has received the somewhat curious title of the “Marine Vivarium”’; and in the following year the guidebook to the Zoological Gardens called it the ‘Aquatic Vivarium’.

Within a year or two of this, however, the term aquarium had been coined and apparently established.
[aquarium etymology, aquarium origin, 英语词源]
varlet: varlet: [15] Varlet and valet [16] are doublets – they come from the same ultimate source. This was Vulgar Latin *vassus, a borrowing from Old Celtic *wasso- ‘young man, squire’. From *vassus were derived two medieval Latin diminutive forms: vassallus, which has given English vassal [14], and *vassellitus. This passed into Old French as vaslet, which diversified into valet (source of English valet) and varlet (source of English varlet).

Both to begin with retained their original connotations of a ‘young man in service to a knight’, and hence by extension any ‘feudal retainer or servant’, but while valet still denotes a ‘servant’, varlet went down in the world in the 16th century to ‘knave’.
=> valet, vassal
administer (v.): late 14c., administren, aministren "to manage as a steward," from Old French amenistrer "help, aid, be of service to" (12c., Modern French administrer, the -d- restored 16c.), and directly from Latin administrare "to help, assist; manage, control, guide, superintend; rule, direct," from ad- "to" (see ad-) + ministrare "serve" (see minister (v.)). Used of medicine, etc., "to give," from 1540s. Related: Administered; administering.
fee (n.): Middle English, representing the merger or mutual influence of two words, one from Old English, one from an Old French form of the same Germanic word, and both ultimately from a PIE root meaning "cattle."

The Old English word is feoh "livestock, cattle; movable property; possessions in livestock, goods, or money; riches, treasure, wealth; money as a medium of exchange or payment," from Proto-Germanic *fehu- (cognates: Old Saxon fehu, Old High German fihu, German Vieh "cattle," Gothic faihu "money, fortune"). This is from PIE *peku- "cattle" (cognates: Sanskrit pasu, Lithuanian pekus "cattle;" Latin pecu "cattle," pecunia "money, property").

The other word is Anglo-French fee, from Old French fieu, a variant of fief "possession, holding, domain; feudal duties, payment" (see fief), which apparently is a Germanic compound in which the first element is cognate with Old English feoh.

Via Anglo-French come the legal senses "estate in land or tenements held on condition of feudal homage; land, property, possession" (c. 1300). Hence fee-simple (late 14c.) "absolute ownership," as opposed to fee-tail (early 15c.) "entailed ownership," inheritance limited to some particular class of heirs (second element from Old French taillir "to cut, to limit").

The feudal sense was extended from landholdings to inheritable offices of service to a feudal lord (late 14c.; in Anglo-French late 13c.), for example forester of fe "a forester by heritable right." As these often were offices of profit, the word came to be used for "remuneration for service in office" (late 14c.), hence, "payment for (any kind of) work or services" (late 14c.). From late 14c. as "a sum paid for a privilege" (originally admission to a guild); early 15c. as "money payment or charge exacted for a license, etc."
good (adj.): Old English god (with a long "o") "excellent, fine; valuable; desirable, favorable, beneficial; full, entire, complete;" of abstractions, actions, etc., "beneficial, effective; righteous, pious;" of persons or souls, "righteous, pious, virtuous;" probably originally "having the right or desirable quality," from Proto-Germanic *godaz "fitting, suitable" (cognates: Old Norse goðr, Dutch goed, Old High German guot, German gut, Gothic goþs), originally "fit, adequate, belonging together," from PIE root *ghedh- "to unite, be associated, suitable" (cognates: Old Church Slavonic godu "pleasing time," Russian godnyi "fit, suitable," Old English gædrian "to gather, to take up together").

Irregular comparative and superlative (better, best) reflect a widespread pattern in words for "good," as in Latin bonus, melior, optimus.

Sense of "kind, benevolent" is from late Old English in reference to persons or God, from mid-14c. of actions. That of "friendly, gracious" is from c. 1200. Meaning "fortunate, prosperous, favorable" was in late Old English. As an expression of satisfaction, from early 15c. Of persons, "skilled (at a profession or occupation), expert," in late Old English, now typically with at; in Middle English with of or to. Of children, "well-behaved," by 1690s. Of money, "not debased, standard as to value," from late 14c. From c. 1200 of numbers or quantities, "large, great," of time or distance, "long;" good while "a considerable time" is from c. 1300; good way "a great distance" is mid-15c.
Why then, can one desire too much of a good thing. ["As You Like It"]
As good as "practically, virtually" is from mid-14c.; to be good for "beneficial to" is from late 14c. To make good "repay (costs, expenses), atone for (a sin or an offense)" is from late 14c. To have a good mind "have an earnest desire" (to do something) is from c. 1500. Good deed, good works were in Old English as "an act of piety;" good deed specifically as "act of service to others" was reinforced early 20c. by Boy Scouting. Good turn is from c. 1400. Good sport, of persons, is from 1906. The good book "the Bible" attested from 1801, originally in missionary literature describing the language of conversion efforts in American Indian tribes. Good to go is attested from 1989.
minister (n.): c. 1300, "one who acts upon the authority of another," from Old French menistre "servant, valet, member of a household staff, administrator, musician, minstrel" (12c.), from Latin minister (genitive ministri) "inferior, servant, priest's assistant" (in Medieval Latin, "priest"), from minus, minor "less," hence "subordinate," (see minus) + comparative suffix *-teros. Formed on model of magister. Meaning "priest" is attested in English from early 14c. Political sense of "high officer of the state" is attested from 1620s, from notion of "service to the crown."
setness (n.): 1640s, from set (n.2) + -ness. Old English had setnes, which was pressed into service to translate various ideas in Roman law and Christianity: "foundation, creation, construction; size, extent; law, ordinance; instruction; sentence."