lambent (adj.)youdaoicibaDictYouDict
1640s, from figurative use of Latin lambentem (nominative lambens), present participle of lambere "to lick," from PIE root *lab-, indicative of smacking lips or licking (cognates: Greek laptein "to sip, lick," Old English lapian "to lick, lap up, suck;" see lap (v.1)).
lap (v.1)youdaoicibaDictYouDict
"take up liquid with the tongue," from Old English lapian "to lap up, drink," from Proto-Germanic *lapojan (cognates: Old High German laffen "to lick," Old Saxon lepil, Dutch lepel, German Löffel "spoon"), from PIE imitative base *lab- (cognates: Greek laptein "to sip, lick," Latin lambere "to lick"), indicative of licking, lapping, smacking lips. Meaning "splash gently" first recorded 1823, based on similarity of sound. Related: Lapped; lapping.
smack (v.3)youdaoicibaDictYouDict
mid-13c., "to smell (something"); mid-14c., "to taste (something), perceive by taste" (transitive); late 14c. "to have a taste, taste of" (intransitive), from smack (n.1). Compare Old English smæccan "to taste," Old Frisian smakia Middle Dutch smaecken, Old High German smakken "have a savor, scent, or taste," German schmecken "taste, try, smell, perceive." Sometimes also smatch. Now mainly in verbal figurative use smacks of ... (first attested 1590s). "Commonly but erroneously regarded as identical with [smack (n.2)], as if 'taste' proceeds from 'smacking the lips.'" [Century Dictionary]
splat (v.)youdaoicibaDictYouDict
"to land with a smacking sound," 1897, probably of imitative origin. As a noun from 1958.