"small cage for poultry," mid-14c., coupe, from Old English cype, cypa "large wicker basket, cask," akin to Middle Dutch kupe, Swedish kupa, and all probably from Latin cupa "tub, cask," from PIE *keup- "hollow mound" (see cup (n.)).
before vowels pyel-, medical word-forming element used from mid-19c. in forming medical terms, from Greek pyelos "oblong trough, bathing-tub," a word of uncertain etymology, taken in modern scientific use for "pelvis."
Old English hyf "beehive," from Proto-Germanic *hufiz (source also of Old Norse hufr "hull of a ship"), from PIE *keup- "round container, bowl" (source also of Sanskrit kupah "hollow, pit, cave," Greek kypellon "cup," Latin cupa "tub, cask, vat;" see cup (n.)). Figurative sense of "swarming, busy place" is from 1630s.