synechthran n. [Gr. syn, together; echtos, hate] An insect guest that is persecuted by its host, and manages to stay alive by greater speed and agility or the use of defensive mechanisms; an animal engaged in synechthry. see me-tochy.
synechthry n. [Gr. syn, together; echtos, hate] The relationship between a symbiont, generally a scavenger, parasite or predator, that is treated in a hostile manner by the host; metochy.
synecology n. [Gr. syn, together, oikos, household; logos, discourse] The relationship of populations and communities to biotic factors in the environment. see autecology.
synectic a. [Gr. syn, together; nektikos, habitual] Pertaining to cells that retain their relative position during gastrulation.
synergism n. [Gr. synergos, associate] The cooperative action of two entities to effect a greater difference than both together, i.e., hormones, parasites, muscles. synergistic a.
syngamy n. [Gr. syn, together; gamos, marriage] 1. Union of male and female gametes following fertilization to form a zygote; gametogamy; hylogamy. see pseudogamy. 2. Permanent union of both female and male reproductive units; male element sometimes greatly reduced and parasitic in the female.
syngenesis n. [Gr. syn, together; genesis, beginning] 1. Reproduction between two sexually dimorphic parents; sexual reproduction. 2. The theory that the germ of the offspring is derived from both parents, not from either alone.
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