château d'eau

[ shah-toh doh ]
/ ʃɑ toʊ ˈdoʊ /

noun, plural châ·teaux d'eau [shah-toh doh] /ʃɑ toʊ ˈdoʊ/. French.

an architecturally treated fountain or cistern.

Origin of château d'eau

lit: castle of water