Impregnation or fertilization of an animal by the external contact of genital orifices, without intromission. Also: †fertilization of plants by…

Origination or development with no external cause; self-generation, self-perpetuation. Cf. autogenesis, n.

Zoology. The process of reproduction by gemmæ or buds; the formation of a new individual by the protrusion and complete or partial separation of a…

Reproduction from a gamete without fertilization, occurring most commonly in invertebrates and lower plants. Formerly also: asexual reproduction, as…

virgin generation, virgin procreation, virgin production or virgin reproduction: parthenogenesis.

Biology. The reactivation of vegetative cells, resulting in cell division and (in multicellular organisms) regrowth from old or injured parts; the…

Asexual reproduction.

Biology. Vegetative reproduction. Obsolete. rare.

Origination with no external cause; self-generation.

Applied to asexual reproduction: see quot. 1858 (Opposed to heterogenesis, n. 2) Obsolete.

Biology and Medicine. Increase or growth, esp. of or involving cells of the same type; an instance of this.

Biology. Generation from a single (non-sexual) parent; vegetative reproduction; = monogony, n. Obsolete.

Biology. The movement characteristic of swarm-spores; reproduction by swarm-spores.

A form of parthenogenesis involving reproduction by an organism still in the larval or other immature stage (known chiefly in gall midges and…

Generation from a single (non-sexual) parent; vegetative reproduction; = monogenesis, n. 3.

parthenogenesis.

Biology. The spontaneous separation or breaking up of a cell into two or more approximately equal parts that constitute daughter-cells, usually…

Biology. Vegetative reproduction; = monogenesis, n. 3.

= parthenogenesis, n.

the union of two unequal gametes in reproduction.

The union of two equal and similar ‘gametes’ or cells in reproduction, as in conjugation.

M. Hartog's term for: a mode of reproduction in which the nuclei which fuse to form the zygote nucleus lie in a continuous mass of cytoplasm…

Horticulture. (See quot. 1891.)

Sexual reproduction by an animal which retains the juvenile or larval characteristics of its species, or of an ancestral form. Cf. paedomorphosis, n.

= parthenogenesis, n.

Biology (a) The condition of having or producing heterogametes; reproduction involving heterogametes. (b) Heterogamous reproduction.

the production of females only in parthenogenesis.

Biology. = exflagellation, n.

(a) the union of cells; esp. plasmogamy; (b) a kind of reproduction that occurs in certain ciliate protozoans, in which two individuals undergo…

Botany. A form of apomixis in which the embryo develops from the female gamete following the stimulus of pollination but without fertilization…

combining form representing Greek τύχη fortune, chance, used in a few recent scientific terms. tychoparthenoˈgenesis n. exceptional or occasional…

The fusion of two cells, or of their nuclei, in reproduction.

Mycology. Fusion between two vegetative cells, rather than between gametes; somatogamy. Now disused.

The production of structures or bodies outside the organism.

In certain protists: reproduction by the fusion of gametes derived from the same parent cell.

Reproduction of organisms without fertilization (see quot. 1932). (opposed to amphimixis; see amphi-, prefix.)

Precocious sexual maturity in an organism still in a larval (or other immature) stage (= paedogenesis, n. 2); (also) accelerated maturation of the…

Asexual reproduction occurring in certain plants in which seeds are produced from unfertilized ovules.

The fusion of gametes; sexual reproduction involving the fusion of gametes.

= pseudogamy, n. 2.

Zoology. The spontaneous division and detachment of the hydranths of tubularian Hydrozoa when mature. (New Sydenham Soc. Lexicon 1882.)