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Origin and history of -acious

-acious

compound adjectival word-forming element of Latin origin, attached to verb stems and expressing intensity of action: "given to, inclined to, abounding in," or expressing intensity of physical or mental action, from Latin -aci- (nominative -ax, accusative -acem), noun ending used with verbal stems (see -acea), + -ous. The accompanying nouns are formed in -acity.

Entries linking to -acious

predacious(adj.)

also predaceous, "living by prey, disposed to prey or plunder, predatory," 1713, from stem of predation (Latin praedari) + -acious.

-acea

word-forming element in Modern Latin making names for orders and classes in zoology (Crustacea, Cetacea, etc.), from Latin -acea, neuter plural of -aceus "belonging to, of the nature of" (enlarged from adjectival suffix -ax, genitive -acis).

The names are thus formally adjectives, Latin animalia "animals" (a neuter plural noun) being understood. Thus Crustacea "shellfish" are *crustacea animalia "crusty animals."

In botany, the suffix is -aceae, from the fem. plural of -aceus, forming orders or families of plants (Rosaceae, etc.) with a presumed plantae "plants," which is a fem. plural.

-ous

word-forming element making adjectives from nouns, meaning "having, full of, having to do with, doing, inclined to," from Old French -ous, -eux, from Latin -osus (compare -ose (1)). In chemistry, "having a lower valence than forms expressed in -ic."

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    poverty
    late 12c., poverte, "destitution, want, need or insufficiency of money or goods," from Old French poverte, povrete "poverty, misery, wretched condition" (Modern French pauvreté), from Latin paupertatem (nominative paupertas) "poverty," from pauper "poor" (see poor (adj.)). From e
    salon
    1690s, "large room or apartment in a palace or great house," from French salon "reception room" (17c.), from Italian salone "large hall," from sala "hall," from a Germanic source (compare Old English sele, Middle English salle, Old Norse salr "hall," Old High German sal "hall, ho
    assume
    early 15c., "to arrogate, take upon oneself," from Latin assumere, adsumere "to take up, take to oneself, take besides, obtain in addition," from ad "to, toward, up to" (see ad-) + sumere "to take," from sub "under" (see sub-) + emere "to take" (from PIE root *em- "to take, distr
    deliver
    c. 1200, deliveren, "save, rescue, set free, liberate," from Old French delivrer "to set free; remove; save, preserve; hand over (goods)," also used of childbirth, from Late Latin deliberare, from de "away" (see de-) + Latin liberare "to free," from liber "free, unrestricted, uni
    ether
    late 14c., "upper regions of space," from Old French ether (12c.) and directly from Latin aether "the upper pure, bright air; sky, firmament," from Greek aithēr "upper air; bright, purer air; the sky" (opposed to aēr "the lower air"), from aithein "to burn, shine," from PIE *aidh
    plagiarism
    "the purloining or wrongful appropriation of another's ideas, writing, artistic designs, etc., and giving these forth as one's own" [Century Dictionary], 1620s, from -ism + plagiary (n.) "plagiarist, literary thief" (c. 1600), from Latin plagiarius "kidnapper, seducer, plunderer,
    preliminary
    "preceding and leading up to something more important," 1660s, from French préliminaire and directly from Medieval Latin praeliminaris, from Latin prae "before" (see pre-) + limen (genitive liminis) "threshold" (see limit (n.)). A word that arose in reference to painstaking diplo
    asphalt
    early 14c., "hard, resinous mineral pitch found originally in Biblical lands," from Late Latin asphaltum, from Greek asphaltos "asphalt, bitumen," often said to be from Greek a- "not" + *sphaltos "able to be thrown down," taken as verbal adjective of sphallein "to throw down," ac
    scalper
    1650s as a type of surgical instrument; 1760 as "one who takes or removes scalps," agent noun from scalp (v.). The meaning "person who re-sells tickets at unauthorized prices for a profit" is by 1869 in American English; the earliest reference is to theater tickets, but it more o
    proper
    c. 1300, propre, "adapted to some purpose, fit, apt; commendable, excellent" (sometimes ironic), from Old French propre "own, particular; exact, neat, fitting, appropriate" (11c.) and directly from Latin proprius "one's own, particular to itself," from pro privo "for the individu

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