ultraslow

adjective
ul·​tra·​slow | \ ˌəl-trə-ˈslō How to pronounce ultraslow (audio) \

Definition of ultraslow

: moving with, exhibiting, or marked by extremely low speed : extremely or extraordinarily slow ultraslow motion

First Known Use of ultraslow

1870, in the meaning defined above

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The first known use of ultraslow was in 1870

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