Image via Wikipediahollow, perforated plastic ball, registered trademark name (The Wiffle Ball Inc., Shelton, Connecticut, U.S.), attested from 1954. According to the company, designed in 1953 by David N. Mullany "in response to a lack of field space and numerous broken windows by his baseball-playing son," the name based on whiff (q.v.), baseball slang for a missed swing.
Image via Wikipedia"hot season of the year," O.E. sumor, from P.Gmc. *sumur- (cf. O.S., O.N., O.H.G. sumar, O.Fris. sumur, M.Du. somer, Du. zomer, Ger. Sommer), from PIE base *sem- (cf. Skt. sama "season, half-year," Avestan hama "in summer," Armenian amarn "summer," O.Ir. sam, O.Welsh ham, Welsh haf "summer"). O.N. sumarsdag, first day of summer, was the Thursday that fell between April 9 and 15. For Indian summer see India. The verb meaning "to pass the summer" is recorded from c.1440. Summer camp is attested from 1893; summer resort is from 1832; summer school first recorded 1860; theatrical summer stock id attested from 1942. Summertime is recorded from 1377; in Britain, as two words, with ref. to what in U.S. is "daylight saving time," it is recorded from 1916.
Image via WikipediaO.E. þunor, from P.Gmc. *thunraz (cf. O.N. þorr, O.Fris. thuner, M.Du. donre, Du. donder, O.H.G. donar, Ger. Donner "thunder"), from PIE *(s)tene- "to resound, thunder" (cf. Skt. tanayitnuh "thundering," Pers. tundar "thunder," L. tonare "to thunder"). Swed. tordön is lit. "Thor's din." The intrusive -d- is also found in Du. and Icelandic versions of the word. The verb is O.E. þunrian; fig. sense of "to speak loudly, threateningly, bombastically" is recorded from c.1340. Thunderbolt is from c.1440; thunderclap is from c.1386; thunderstruck is from 1613, originally fig.; the lit. sense always has been rare. Thunderhead "high-piled cloud" is recorded from 1861.
