"melancholic," 1725, from Medieval Latin atrabilarius; an alternative of atrabilious (q.v.). Other alternatives are, or were, atrabilarious (1680s), atrabilarian (1670s), atrabilaric (1620).
atonement
atop
atopic
atopy
ATP
atrabiliary
atrabilious
atremble
atresia
Atreus
atria
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