sebum Noun, n, sebum

1. sebum

Appox. usage (any sense): 0.015 per million words

usuc Noun, n, usuc

1. (rare, regional) sebum, an oily substance covering the wool sheared from a sheep, which is then washed off
2. (rare, regional) the dirty water consisting of this washed out material

Appox. usage (any sense): 1.13 per million words