Obvious or easily perceived; noticeable.
Although the Celebrity was almost impervious to sarcasm, he was now beginning to exhibit visible signs of uneasiness,[…]. It was with a palpable relief that he heard the first warning notes of the figure.
That can be detected by palpation.
From Middle French palpable and its source, Latin palpābilis, which is from palpō (“to touch softly”) + -bilis.
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