n. 〔德语〕【生物学】环境钟〔指能够影响生物对时间之感应的任何一种时间指示因素，如光、黑暗、温度等〕。
Zeitgeber (from German for "time giver," or "synchronizer") is any exogenous (external) cue that synchronizes an organism's endogenous time-keeping system (internal clock) to the earth's 24-hour light/dark cycle and 12 month cycle . The strongest zeitgeber, for both plants and animals, is light.
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