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Epizoon :: Epizoon (n.) One of the artificial group of invertebrates of various kinds, which live parasitically upon the exterior of other animals; an ectozoon. Among them are the lice, ticks, many acari, the lerneans, or fish lice, and other crustaceans..

Spermatozoid :: Spermatozoid (n.) The male germ cell in animals and plants, the essential element in fertilization; a microscopic animalcule-like particle, usually provided with one or more cilia by which it is capable of active motion. In animals, the familiar type is that of a small, more or less ovoid head, with a delicate threadlike cilium, or tail. Called also spermatozoon. In plants the more usual term is antherozoid..

Polyspermy :: Polyspermy (n.) Fullness of sperm, or seed; the passage of more than one spermatozoon into the vitellus in the impregnation of the ovum..

Phytozoon :: Phytozoon (n.) A plantlike animal. The term is sometimes applied to zoophytes.

Polyzoan :: Polyzoan (n.) A polyzoon.

Hydrozoon :: Hydrozoon (n.) One of the Hydrozoa.

Haematozoon :: Haematozoon (n.) A parasite inhabiting the bloo.

Spermatozoon :: Spermatozoon (n.) Same as Spermatozoid.

Calzoons :: Calzoons (n. pl.) Drawers.

Protozoon :: Protozoon (n.) A single zooid of a compound protozoan.

Impregnation :: Impregnation (n.) The fusion of a female germ cell (ovum) with a male germ cell (in animals, a spermatozoon) to form a single new cell endowed with the power of developing into a new individual; fertilization; fecundation..

Haematozoon :: Haematozoon (n.) The trematode, Bilharzia haematobia, which infests the inhabitants of Egypt and other parts of Africa, often causing death..

Zoonule :: Zoonule (n.) Same as Zoonite.

Protozoonite :: Protozoonite (n.) One of the primary, or first-formed, segments of an embryonic arthropod..

Acephalocyst :: Acephalocyst (n.) A larval entozoon in the form of a subglobular or oval vesicle, or hydatid, filled with fluid, sometimes found in the tissues of man and the lower animals; -- so called from the absence of a head or visible organs on the vesicle. These cysts are the immature stages of certain tapeworms. Also applied to similar cysts of different origin..

Eozoon :: Eozoon (n.) A peculiar structure found in the Archaean limestones of Canada and other regions. By some geologists it is believed to be a species of gigantic Foraminifera, but others consider it a concretion, without organic structure..

Zoon :: Zoon (n.) Any one of the perfectly developed individuals of a compound animal.

Zoon :: Zoon (n.) An animal which is the sole product of a single egg; -- opposed to zooid.

Entozoon :: Entozoon (n.) One of the Entozoa.

Endoparasite :: Endoparasite (n.) Any parasite which lives in the internal organs of an animal, as the tapeworms, Trichina, etc.; -- opposed to ectoparasite. See Entozoon..

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