Âåëèêà Ðàäÿíñüêà Åíöèêëîïåä³ÿ
óäðîá³îñ (â³ä ã³äðî ... ³ ãðåö. bios - æèòòÿ), ñóêóïí³ñòü îðãàí³çì³â, ùî íàñåëÿþòü âîäîéìè âñ³º¿ çåìíî¿ êóë³. Âèâ÷åííÿì Ã. çàéìàºòüñÿ ã³äðîá³îëîã³ÿ .