Webster 1913 Edition
imp. & p. p.
p. pr. & vb. n.
eglanto trouble, pain; akin to Goth. us-
aglitha, pain, and prob. to E.
To affect with pain or uneasiness, either physical or mental; to trouble; to be the matter with; – used to express some uneasiness or affection, whose cause is unknown;
ailsthe man? I know not what
Gen. xxi. 17.
☞ It is never used to express a specific disease. We do not say, a fever ails him; but, something ails him.
To be affected with pain or uneasiness of any sort; to be ill or indisposed or in trouble.
ailsever so little . . . he is so peevish.
Indisposition or morbid affection.
Webster 1828 Edition
To trouble; to affect with uneasiness, either of body or mind; used to express some uneasiness or affection, whose cause is unknown; as, what ails the man? I know not what ails him.
What aileth thee, Hagar? Gen. 21.
It is never used to express a specific disease. We never say, he ails a pleurisy; but it is unusual to say, he ails something; he ails nothing; nothing ails him.