2. (Zool.) A genus of lophobranch fishes of several species in which the head and neck have some resemblance to those of a horse; -- called also sea horse. [1913 Webster]

☞ They swim slowly, in an erect position, and often cling to seaweeds by means of the incurved prehensile tail. The male has a ventral pouch, in which it carries the eggs till hatched. [1913 Webster]

3. (Zool.) A name applied to either of two ridges of white matter in each lateral ventricle of the brain. The larger is called hippocampus major or simply hippocampus. The smaller, hippocampus minor, is called also ergot and calcar. [1913 Webster]

Hippocrates' sleeve, a conical strainer, made by stitching together two adjacent sides of a square piece of cloth, esp. flannel of linen. [ 1913 Webster ]

Hippocratic face [ L. facies Hippocratica ], the change produced in the countenance by death, or long sickness, excessive evacuations, excessive hunger, and the like. The nose is pinched, the eyes are sunk, the temples hollow, the ears cold and retracted, the skin of the forehead tense and dry, the complexion livid, the lips pendent, relaxed, and cold; -- so called, as having been described by Hippocrates. Dunglison. [ 1913 Webster ]

☞ An English translation of the oath reads:

I swear by Apollo the physician, by Aesculapius, and Health, and All-heal, and all the gods and goddesses, that according to my ability and my judgement, I will keep this Oath and this stipulation -- to reckon him who taught me this Art equally dear to me as my parents, to share my substance with him, and relieve his necessities if required; to look upon his offspring in the same footing as my own brothers, and to teach them this Art, if they wish to learn it, without fee or stipulation; and that by precept, lecture, and every mode of instruction, I will impart a knowledge of the Art to my own sons, and of my teachers, and to disciples bound by a stipulation and oath according to the law of medicine, but to none others.

I will follow that system or regimen which, according to my ability and judgement, I consider for the benefit of my patients, and abstain from whatever is deleterious and mischievous.

I will give no deadly medicine to any one if asked, nor suggest any such counsel; and in like manner I will not give to a woman a pessary to produce abortion.

With purity and with holiness I will pass my life and practice my Art. I will not cut persons labouring under the stone, but will leave this to be done by men who are practitioners of this work. Into whatever houses I enter, I will go into them for the benefit of the sick, and will abstain from every voluntary act of mischief and corruption; and, further, from the seduction of females or males, of freemen and slaves.

Whatever, in connection with my professional service, or not in connection with it, I see or hear, in the life of men, which ought not to be spoken of abroad, I will not divulge, as reckoning that all such should be kept secret.

While I continue to keep this Oath unviolated, may it be granted to me to enjoy life and the practice of the Art, respected by all men, in all times. But should I trespass and violate this Oath, may the reverse be my lot.

Nor maddening draughts of Hippocrene. Longfellow. [1913 Webster]

2. An arena for equestrian performances; a circus. [1913 Webster]

3. (Sports) A fraudulent contest with a predetermined winner. [Slang, U. S.] [Webster 1913 Suppl.]

Bessy would either do fieldwork, or attend to the cows, the shippon, or churn, or make cheese. Dickens. [ 1913 Webster ]