Becoming or tending to become slender or gracile; showing increasing slenderness.
From Latin 'gracilis' (slender) plus '-escent' (becoming, growing). The '-escent' suffix, from Latin 'escere', describes processes of change, as in 'adolescent' or 'obsolescent'.
The '-escent' suffix is how we describe change in progress—it's the difference between 'old' (state) and 'obsolescent' (becoming old). It captures transition!
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