1. Important derivatives are: heart, cordial, courage, quarry¹ accord, discord, record, cardiac, credence, credible, credit, grant
重要派生词为： heart， cordial， courage， quarry¹ accord， discord， record， cardiac， credence， credible， credit， grant

2. Heart.
心，勇气，中心.

3. Suffixed form *kerd-en- . heart , from Old English heorte , heart, from Germanic *hert?n- .
添加后缀的形式*kerd-en- . heart , 源自 古英语 heorte , 心, 源自 日耳曼语 *hert?n- .

4. Zero-grade form *k^—d- .
零级形式*k^—d- .

5. cordate , cordial , courage , quarry ¹ ; accord , concord , cordiform , discord , misericord , record , from Latin cor (stem cord- ), heart;
cordate , cordial , courage , quarry ¹ ; accord , concord , cordiform , discord , misericord , record , 源自 拉丁语 cor （词干 cord- ),心脏，勇气，中心 ;

6. suffixed form *k^—d-y3- . cardia , cardiac , cardio- ; endocardium , epicardium , megalocardia , myocardium , pericardium , from Greek kardia , heart, stomach, orifice.
添加后缀的形式 *k^—d-y3- . cardia , cardiac , cardio- ; endocardium , epicardium , megalocardia , myocardium , pericardium , 源自 希腊语 kardia , 心脏, 胃, 孔.

7. Possibly *kred-dh…- , “to place trust” (an old religious term; *dh…- , to do, place; see dh?- ). credence , credible , credit , credo , credulous , grant ; miscreant , recreant , from Latin cr?dere , to believe.
可能为*kred-dh…- , “使信任” （一个古老的宗教术语; *dh…- , 做, 安排; 参见 dh?-). credence , credible , credit , credo , credulous , grant ; miscreant , recreant , 源自 拉丁语 cr?dere , 相信.

kerd的词源：

8. Pokorny ^?ered- 579.
波科尔尼^?ered- 579.