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syllogism in logic, a type of deductive reasoning based on a major and a minor premise, whose conclusion must be true if the two premises are true. [2 definitions]
sylph in myth, any of a group of beings that inhabit the air. [2 definitions]
sylvan pertaining to or characteristic of woods or forests. [3 definitions]
sym- together.
symbiont an organism that lives in a symbiotic relationship with another.
symbiosis a close association, usu. a mutually beneficial relationship, between two dissimilar organisms.
symbol something that represents something else, esp. a material sign or object that stands for a complex or abstract concept. [2 definitions]
symbolic of, relating to, or represented by a symbol. [3 definitions]
symbolic logic a modern kind of formal logic employing a system of symbols to represent relationships, quantities, or propositions.
symbolism the practice of expressing things, as in art or literature, by means of symbols. [3 definitions]
symbolist one who uses, studies, or interprets symbols or symbolism. [2 definitions]
symbolize to be a symbol of. [2 definitions]
symbology the study or explanation of symbols or symbolism. [2 definitions]
symmetric variant of "symmetrical."
symmetrical having a form, structure, effect, or parts such that there is an equal and corresponding distribution on each side of a central line or position; having symmetry.
symmetry a state in which parts on opposite sides of a plane, line, or point display the same size, form, or arrangement. [2 definitions]
sympathetic feeling, showing, or resulting from sympathy or understanding. [5 definitions]
sympathize to feel or express compassion or tenderness for another, esp. one suffering sorrow or difficulty; give condolences to (often fol. by "with"). [3 definitions]
sympathy kind understanding and concern felt for others because they are having difficulty, suffering, or are experiencing sadness, grief, anger, or the like. [6 definitions]
sympathy strike a strike by a group of workers to show support for or agreement with another body of workers who are striking.
sympatico variant of simpatico.