undern
Undern (noun) means Another word for terce, the time about nine in the morning.
Etymology
Came into English via Middle English undern, ondern, which developed from Old English undern (“third hour of the day; nine o'clock; morning”), from Proto-Germanic *undurniz (“interval”), in turn from Proto-Indo-European *h₁n̥ter, *h₁enter (“between”). It is cognate with dialectal Dutch onder, dialectal German Untern and dialectal Swedish undarn.