September is Etymology Month (1)

All definitions this month from the Online Etymology Dictionary here.

heart O.E. heorte "heart; breast, soul, spirit, will, desire; courage; mind, intellect," from P.Gmc. *khertan- (cf. O.S. herta, O.Fris. herte, O.N. hjarta, Du. hart, O.H.G. herza, Ger. Herz, Goth. hairto), from PIE *kerd- "heart" (cf. Gk. kardia, L. cor, O.Ir. cride, Welsh craidd, Hittite kir, Lith. širdis, Rus. serdce "heart," Breton kreiz "middle," O.C.S. sreda "middle"). Spelling with -ea- is c.1500, reflecting what then was a long vowel, and remained when pronunciation shifted. Most of the figurative senses were present in O.E., including "intellect, memory," now only in by heart. Heart attack attested from 1935; heart disease is from 1864. The card game hearts is so called from 1886.