51吃瓜 of the Day
laeotropic
adjective
oriented or coiled in a leftward direction, as a left-spiraling snail shell.
More about laeotropic
The adjective laeotropic 鈥渢urning leftward鈥� is restricted to describing snail shells. The second element, -tropic 鈥渢urning (to),鈥� is common enough in the physical sciences, e.g., geography, meteorology, chemistry. The first element laeo- is rare. It comes from the Greek adjective 濒补颈贸蝉 鈥渓eft, on the left鈥� (there is one ancient lexicographical reference implying the form 濒补颈飞贸蝉). 尝补颈飞贸蝉 is all but identical to Latin laevus and pretty close to Slavic (Polish) lewy. Outside these three branches of the Indo-European languages (and possibly also Lithuanian, among the Baltic languages), laiwo- does not occur. Laeotropic entered English in the 19th century.
how is laeotropic used?
The arms of the cross are slightly oblique; and it is worthy of note that the direction of their inclination is laeotropic, while in Crepidula and Ischnochiton the arms show a slight dexiotropic twist.
… the direction of corresponding cleavages is the same, i.e., the second cleavage is laeotropic and the third dexiotropic, and so on …. Why should this constancy occur?
Perseid
noun
Astronomy. any of a shower of meteors appearing in August and radiating from a point in the constellation Perseus.
More about Perseid
Perseid may have been introduced into English from Italian Perseidi, coined by the distinguished Italian astronomer Giovanni Schiaparelli (1835-1910), who is unfortunately best remembered today for the mistranslation into English of Italian canali 鈥渃hannels鈥� on Mars as 鈥渃anals,鈥� which has inspired decades and decades of science fiction. Perseid ultimately comes from Greek 笔别谤蝉别铆诲脓蝉 鈥渙ffspring or daughters of Perseus,鈥� because the meteors appear to be coming from the constellation Perseus. Perseid entered English in the 19th century.
how is Perseid used?
Comet Swift-Tuttle is the largest object known to repeatedly pass by Earth; its nucleus is about 16 miles (26 kilometers) wide. It last passed nearby Earth during its orbit around the sun in 1992, and the next time will be in 2126. But it won’t be forgotten in the meantime, because Earth passes through the dust and debris it leaves behind every year, creating the annual Perseid meteor shower.
The Perseids also feature 鈥渇ireballs,鈥� which are meteors of bright color and longer streaks that sometimes have 鈥渕agnitudes greater than -3.鈥�
decorous
adjective
characterized by dignified propriety in conduct, manners, appearance, character, etc.
More about decorous
The English adjective decorous ultimately derives from Latin 诲别肠艒谤耻蝉 鈥渁cceptable, fitting, proper.鈥� The adjective 诲别肠艒谤耻蝉 is a derivative of the noun decus (inflectional stem decor-) 鈥渆steem, honor.鈥� The Latin words derive from the Proto-Indo-European root dek-, dok- 鈥渢o accept, take,鈥� from which Latin also derives the verb 诲别肠脓谤别 鈥渢o be acceptable, be fitting,鈥� whose present participle stem decent- is the source of English decent. From the root dok- Latin forms the verb 诲辞肠脓谤别 鈥渢o teach (i.e., to make acceptable, make fitting).鈥� The English derivatives of 诲辞肠脓谤别 include doctrine and docent. The same root appears in Greek 诲辞办别卯苍 鈥渢o expect, suppose, imagine, seem, seem good,鈥� and its derivative nouns 诲贸驳尘补 鈥渨hat seems good, opinion, belief,鈥� source of English dogma, and 诲贸虫补 鈥渆xpectation, opinion, estimation, repute,鈥� and in the Septuagint and the New Testament, 鈥済lory, splendor,鈥� which forms the first element in doxology 鈥渉ymn of praise.鈥� Decorous entered English in the 17th century.
how is decorous used?
If you think British historical dramas are all decorous whisperings about how one should behave upon meeting the queen, this mini-series is here to prove that notion wrong …
The normally decorous Senate has been rocked by heated confrontations this week as fellow Republicans have traded personal and profane insults over how much loyalty to show President Trump.