indurate
Pronunciation: /ˈɪndjʊreɪt/
Derivatives
induration
Pronunciation: /ɪndjʊˈreɪʃ(ə)n/
NOUN
indurative
ADJECTIVE
Origin
Mid 16th century (earlier Middle English) as induration: from Latin indurat- ‘made hard’, from the verb indurare (based on durus ‘hard’).

Interesting.
Not heard or seen this for years….last time precisely in relation to a ‘dried out bed of clay’…. 😉
Interesting how such things become metaphors.I have not seen it at all but it was in use in 16th century! And still in use in a book I am trying to read.But my IQ is only 69 today…. !!
😉 Hugs!