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a person or thing that precipitates an event or change: His imprisonment by the government served as the catalyst that helped transform social unrest into revolution.
Catalyst was originally (at the beginning of the 20th century) a technical term used in chemistry, meaning “a substance that causes or accelerates a chemical reaction without itself being affected.” By the early 1940s, the English poet and critic Sir Herbert Read extended the sense to a poet as a person who precipitates an event or change: “The catalyst [the poet] is unchanged, unabsorbed; its activity therefore not acknowledged.” Catalyst is irregularly formed from the Greek noun katálysis “dissolution, tearing down (especially of governments), a derivative of the verb katalýein “to pull down, destroy, dissolve (a political system), and the (originally Greek) agent suffix –ist. Katalýein is a compound of the Greek preposition and prefix katá, kata– “down, against, back” (usually spelled cata– in English) and the simple verb lýein “to loose, untie, release, solve, resolve.”
What happened in Ferguson is often described as a catalyst—the beginning of a social justice movement that would sweep the nation.
On the heels of the Free-Soil convention in Buffalo, three hundred women and men held a women’s rights convention in Seneca Falls, New York. Margaret Fuller was still in Italy, but it was her work that had served as a catalyst.
a representation of a word or phrase by pictures, symbols, etc., that suggest that word or phrase or its syllables: Two gates and a head is a rebus for Gateshead.
A rebus is a representation of a word or phrase by pictures or symbols suggesting that word or phrase or its syllables. Rebuses were formerly very popular with children in the Sunday funnies. The origin of rebus is disputed, but the most likely source is Latin rēbus “by things,” the ablative plural of the grievously overworked noun rēs “thing, matter, circumstance, affair, property, wealth, etc.” Rēbus is short for nōn verbīs sed rēbus “not by words but by things.” Some French authorities claim that rebus comes from the Latin phrase dē rēbus quae geruntur “concerning the affairs that are going on,” alluding to the satirical pieces composed and performed by the clerks of Picardy (northwest France) in the annual carnival, but this usage is later than attestations of rebus in the sense “puzzle.” Rebus entered English in the early 17th century.
All I wanted to do was wish my fiancée happy birthday using emojis. But I couldn’t replicate the rebus of the classic Sandra Boynton greeting card: Hippo, Birdie, Two Ewes.
It [Seattle] created a new logo: a rebus that featured an eyeball, the “@” symbol, and the letter “L” (pronounced “See-at-L”), above the slogan, “Seattle: soak it up!”
utterly unyielding or firm in attitude or opinion.
Adamantine “unyielding in attitude or opinion; too hard to cut, break, or pierce; like a diamond (in luster)” comes from Middle English adama(u)ntin, from the Middle French adjective adamantin (feminine adamantine), from Latin adamantinus “pertaining to diamondlike adamant or steel; resembling diamonds (saxa adamantina), from Greek adamántinos, an adjective derived from the noun adámas (stem adamant-) “steel (the hardest metal); diamond.” The traditional etymology for adámas is the corresponding adjective meaning “unbreakable,” somehow a derivative of damân “to tame, subdue,” with the privative prefix a-; more likely adámas is a loanword from Semitic. Adamantine entered English in the first half of the 13th century.
Her dedication to the pursuit of equality for the masses was adamantine, however.
And the moment of commitment came with the special force that was central to his character: an adamantine, unshakable conviction that what he was doing was unequivocally right …