Quiz: Remember the definition of mal de mer?
1630s, "capable of feeling," from Latin sentientem (nominative sentiens) "feeling," present participle of sentire "to feel" (see sense (n.)). Meaning "conscious" (of something) is from 1815.
sentient sen·tient (sěn'shənt, -shē-ənt)adj.
Having sense perception; conscious.
Experiencing sensation or feeling.