liquid [ˈlɪkwɪd] n. 液体；流音 adj. 液体的；清澈的；（声音）流畅的；易转换成现款的
liquid: -liqu-液体 + -id 名词或形容词后缀
liquefy [ˈlɪkwəˌfaɪ] vt.& vi. 液化，溶解
liquefy: -liqu-液体 + -e-中缀 + -fy 动词后缀 → 液化，溶解
liquify ['lɪkwəˌfaɪ] v. （使）溶解，（使）液化
liquify: -liqu-液体 + -i-中缀 + -fy 动词后缀 → 液化，溶解
liquesce [lɪ'kwes] vi. 变成液体，液化
liquesce: -liqu-液体 + -esce 动词起始格后缀 → 变成液体，液化
liquate ['laɪkweɪt] vt. 熔解而分离，熔解
liquate: -liqu-液体 + -ate 动词后缀
词根词缀：-liqu-液体 + -id形容词后缀
late 14c., "flowing, capable of flowing; neither solid nor gaseous," from Old French liquide "liquid, running" (13c.), from Latin liquidus "fluid, liquid, moist," figuratively "flowing, continuing," also of sounds and voices, from liquere "be fluid," related to liqui "to melt, flow," from PIE *wleik- "to flow, run."
In English, of sounds from 1630s. Financial sense of "capable of being converted to cash" is first recorded 1818, from earlier use in Scots Law (17c.) in reference to debts that had been proved (in court, etc.).
"a liquid substance," 1708, from liquid (adj.). Earlier it meant "sound of a liquid consonant" (1520s), following Latin liquidae, Greek hygra, applied to letters of an easy, "flowing" sound.