Etymology
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dissuade (v.)

1510s, from French dissuader and directly from Latin dissuadere "to advise against, oppose by argument," from dis- "off, against" (see dis-) + suadere "to urge, incite, promote, advise, persuade," literally "recommend as good" (related to suavis "sweet"), from PIE root *swād- "sweet, pleasant" (see sweet (adj.)).. Related: Dissuaded; dissuading.

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dissuasive (adj.)

"tending to divert from a purpose," c. 1600, from Latin dissuas-, past-participle stem of dissuadere "to advise against, oppose by argument" (see dissuade) + -ive. Related: Dissuasively; dissuasiveness.

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dehortation (n.)

"dissuasion, advice or counsel to the contrary of what is proposed," 1520s, from Late Latin dehortationem (nominative dehortatio), noun of action from past-participle stem of Latin dehortari "to dissuade," from de- "off, away" (see de-) + hortari "to exhort, urge, incite," from PIE root *gher- (2) "to like, want."

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discourage (v.)

mid-15c., discoragen, "deprive of or cause to lose courage," from Old French descoragier "dishearten" (Modern French décourager), from des- "away" (see dis-) + coragier, from corage "spirit" (see courage). Meaning "express disapproval or opposition, dissuade or hinder from" is from 1640s. Related: Discouraged; discouragement; discouraging.

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planet (n.)
Origin and meaning of planet

late Old English planete, in old astronomy, "star other than a fixed star; star revolving in an orbit," from Old French planete (Modern French planète) and directly from Late Latin planeta, from Greek planētēs, from (asteres) planētai "wandering (stars)," from planasthai "to wander," a word of uncertain etymology.

Perhaps it is from a nasalized form of PIE root *pele- (2) "flat; to spread," on the notion of "spread out," "but the semantics are highly problematic," according to Beekes, who notes the similarity of meaning to Greek plazein "to make devious, repel, dissuade from the right path, bewilder," but adds, "it is hard to think of a formal connection."

So called because they have apparent motion, unlike the "fixed" stars. Originally including also the moon and sun but not the Earth; modern scientific sense of "world that orbits a star" is from 1630s in English. The Greek word is an enlarged form of planes, planetos "who wanders around, wanderer," also "wandering star, planet," in medicine "unstable temperature."

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