mio-, meio- +

(Greek: smaller, less, fewer)

miocardia
Decreasing heart volume during systolic contraction.
Miocene
1. The epoch of geologic time, 24 million to 5 million years ago, during which the modern ocean currents were established and Antarctica became frozen.
2. Etymology: from the mid-19th century. Greek meiōn, "less" plus kainos, "recent".
miodidymus, miodymus
Unequal conjoined twins with the head of the smaller twin joined to the occipital region of the head of the larger twin.
Miohippus
A genus of prehistoric horse that lived in what is now North America during the Oligocene Period some 25 to 40 million years ago and having three usable hoofs on each foot.
miolecithal
1. Denoting an egg with little yolk that is uniformly dispersed throughout the egg.
2. Having little or no yolk, as the ova of placental mammals.
mioplasma
Reduction in the plasma volume of circulating blood.
miopragia
1. Reduced functional activity.
2. Diminished functional activity in a body part.
miopus
1. Unequal conjoined twins united at the head in such fashion that the face of one member is rudimentary.
2. Etymology: from Greek mei(on), "smaller, less" plus ops, "eye".
miosis, myosis
1. In medicine, the period in the course of a disease when the symptoms begin to diminish.
2. A contraction of the pupil of the eye; such as, a contraction caused by a reaction to a drug.
3. Constriction of the pupil of the eye, resulting from a normal response to an increase in light or caused by certain drugs or pathological conditions.

Miosis occurs in certain fevers, congestion of iris, typhus, early stages of meningitis, some forms of drug poisoning, brain lesions, and sunstroke.

miotic
1. A substance that causes constriction of the pupil of the eye.
2. Pertaining to or producing miosis.
osteomiosis
The disintegration of bone.
pathomeiosis
The tendency to belittle the importance of one’s disease.
rhinomiosis
An operation to reduce the size of the nose.

Related "few, small, less, little" word units: micro-; mini-; nano-; oligo-, olig-.