hand.

Absorbents (Lat. _absorbere_, to suck up). The vessels which take part in
the process of absorption. Absorption. The process of sucking up
nutritive or waste matters by the blood-vessels or lymphatics.

Accommodation of the Eye. The alteration in the shape of the crystalline
lens, which accommodates, or adjusts, the eye for near or remote vision.

Acetabulum (Lat. _acetabulum_, a small vinegar-cup). The cup-shaped cavity
of the innominate bone for receiving the head of the femur.

Acid (Lat. _acidus_, from _acere_, to be sour). A substance usually sour,
sharp, or biting to the taste.

Acromion (Gr. akron the tip, and omos, the shoulder). The part of the
scapula forming the tip of the shoulder.

Adam's Apple. An angular projection of cartilage in the front of the neck.
It may be particularly prominent in men.

Adductor (Lat. _adduco_, to draw to). A muscle which draws towards the
middle line of the body, or of the hand or foot.

Adenoid (Gr. aden, a gland). Tissue resembling gland tissue.

Afferent (Lat. _ad_, to, and _fero_, to convey). Vessels or nerves
carrying the contents or impulses from the periphery to the center.

Albumen, or Albumin (Lat. _albus_, white). An animal substance resembling
the white of an egg.

Albuminuria. A combination of the words "albumin" and "urine." Presence of
_albumen_ in the _urine_.

Aliment (Lat. _alo_, to nourish). That which affords nourishment; food.

Alimentary (Lat. _alimentum_, food). Pertaining to _aliment_, or food.

Alimentary Canal (Lat. _alimentum_). The tube in which the food is
digested or prepared for reception into the blood.

Alkali (Arabic _al kali_, the soda plant). A name given to certain
substances, such as soda, potash, and the like, which have the power of
combining with acids.

Alveolar (Lat. _alveolus_, a little hollow). Pertaining to the alveoli,
the _cavities_ for the reception of the teeth.

Amoeba (Gr. ameibo, to change). A single-celled, protoplasmic organism,
which is constantly changing its form by protrusions and withdrawals of
its substance.

Amoeboid. Like an _amoeba_.

Ampulla (Lat. _ampulla_, a wine-flask). The dilated part of the
semicircular canals of the internal ear.

Anabolism (Gr. anaballo, to throw or build up). The process by means of
which simpler elements are _built up_ into more complex.

Anaesthetics (Gr. an, without, and aisthesia, feeling). Those medicinal
agents which prevent the feeling of pain, such a