英语词源字典 - 在线词源网站

elbow [elbow 词源字典]: elbow: [OE] Logically enough, elbow means etymologically ‘arm bend’. It comes from a prehistoric West and North Germanīc *alinobogan (which also produced German ellenbogen, Dutch elleboog, and Danish albue). This was a compound formed from *alinā ‘forearm’ and *bogan (source of English bow). However, there is a further twist.

For *alinā (source also of English ell [OE], a measure of length equal to that of the forearm) itself goes back ultimately to an Indo-European base *el-, *ele- which itself meant ‘bend’, and produced not just words for ‘forearm’ (such as Latin ulna), but also words for ‘elbow’ (such as Welsh elin). So at this deepest level of all, elbow means tautologically ‘bend bend’.
=> bow, ell, ulna[elbow etymology, elbow origin, 英语词源]
eviscerate (v.): c. 1600 (figurative); 1620s (literal), from Latin evisceratus, past participle of eviscerare "to disembowel," from assimilated form of ex- "out" (see ex-) + viscera "internal organs" (see viscera). Sometimes used 17c. in a figurative sense of "to bring out the deepest secrets of." Related: Eviscerated; eviscerating.
heartstring: "Used in reference to one’s deepest feelings of love or compassion", Late Middle English (originally in sense 'cord-like structure attached to the heart'): from heart + string.