astheno-, asthen-; -asthenia, -asthenic

(Greek: without strength)

Instability or loss of tone in the vascular system.
Spasmodic variability in the tone of blood vessels.
Strengthening or invigorating.
asthenia (s) (noun), asthenias (pl)
An abnormal lack or loss of strength and energy: Robert's asthenia showed his weakness and lack of vital forces which resulted in his having debility and feebleness.
1. Relating to or exhibiting asthenia; weak.
2. Having a slender, lightly muscled physique.
1. A period of reduced metabolic activity (chemical and physical processes involved in the maintenance of life).
2. Either the condition of an inactive larva not yet metamorphosed to a pupa or autointoxication, particularly among insects.
Sluggish pupillary light reflex.
asthenophobia (s) (noun), asthenophobias (pl)
An unexplained fear of weakness, such as by losing one's physical, social, or some kind of political control: When a person has asthenophobia , he or she may also be afraid of fainting when working too hard.
asthenopia (s) (noun)
Eye weakness, or strain; often causing a headache, ocular discomfort, dimness of vision, etc.: Nigel's asthenia included such symptoms as fatigue, red eyes, eye strain, pain in or around the eyes, blurred vision, and occasional double vision.
A condition in which one has weak feet.
asthenospheric (adjective), more asthenospheric, most asthenospheric
1. A reference to the zone beneath the earth's surface that lies beneath the lithosphere and consists of several hundred kilometers of weak material that readily yields to persistent stresses: According to the theory of plate tectonics, the Earth's lithosphere is a rigid outer layer that moves slowly over the weaker asthenospheric zone.
2. Etymology: from Greek astheneia, "weakness"; which consists of a-, "without" + sthenos, "strength" + -spheric, "being around" or "a zone".
1. A condition of impairment or weakness caused by overwork.
2. Etymology: from Greek ergon, "work" + asthenos, "weakness".