Webster's Revised Unabridged Dictionary · 1913

Hectic

Hectic , adjective

[French hectique, Greek {not transcribed} habitual, consumptive, from {not transcribed} habit, a habit of body or mind, from {not transcribed} to have; akin to Sanskrit sah to overpower, endure; compare Anglo-Saxon sige, sigor, victory, German sieg, Gothic sigis. Compare Scheme.]

1.
Habitual; constitutional; pertaining especially to slow waste of animal tissue, as in consumption; as, a hectic type in disease; a hectic flush.
2.
In a hectic condition; having hectic fever; consumptive; as, a hectic patient.
Collocations (1)
Hectic fever (Medicine) , a fever of irritation and debility, occurring usually at a advanced stage of exhausting disease, as a in pulmonary consumption.

Hectic , noun

1.
(Medicine) Hectic fever.
2.
A hectic flush.
It is no living hue, but a strange hectic. — Byron