Germanic blōd and Latin sanguis carved up European civilization's relationship to blood — and English, alone among the major tongues, kept both streams: the Nordic monosyllable for the bodily red fact, the Latin 'sanguine' for the disposition blood supposedly governed. Spanish collapsed the split; sangre holds vein and temperament together without needing a second etymology. Chinese 血 comes from ritual, not anatomy — a pictograph of a vessel catching the offering, blood conceived first as something given rather than something circulating. Esperanto's sango borrows the Romance root and none of the history.
English uniquely preserved the Germanic root for the physiological sense while borrowing Latin-derived 'sanguine,' 'sanguinary,' and 'consanguinity' for temperament, violence, and kinship — splitting the concept across two etymological lineages after the Norman Conquest. The heavy monosyllable blōd survived where its Latin rival did not.
From Latin sanguinem (accusative of sanguis). Spanish idioms built on sangre span physiology (transfusión de sangre) and social identity (sangre azul, 'blue blood'; de la misma sangre, 'of the same family') without recourse to a Latinate doublet — the single word carries the full semantic load.
An oracle-bone pictograph (c. 1200 BCE): a vessel-shape with a mark inside representing blood collected in a ritual container. The character entered the written record in a sacrificial context — blood as an offering poured into a bowl — before extending to blood as bodily fluid. Its two modern Mandarin readings (literary xuè, colloquial xiě) preserve different phonological strata from Old and Middle Chinese rather than different meanings.
血 is its own Kangxi radical (#143) and is treated as a pictographic root rather than a semantic compound. The coexistence of xuè and xiě reflects register and phonological divergence, not distinct morphemes; xuè is standard in medical and written contexts, xiě in casual speech.
Coined by L. L. Zamenhof in the Unua Libro (1887). Productive derivatives include: sanga (bloody, adj.), sangi (to bleed, v.), sangado (act of bleeding), sangaĵo (bloody matter). Zamenhof systematically drew roots from Greek, Latin, and the major European languages; the Romance family was his dominant source for biological vocabulary.
What first needed naming was not the flow but the spill.