-tropiccomb. form

Primary stress is attracted to the first syllable of this combining form and vowels may be reduced accordingly.

Origin: A borrowing from Greek, combined with an English element. Etymons: Greek τροπή , -ic suffix.

Etymology: < ancient Greek τροπή act of turning (see trope n.) + -ic suffix. Compare French -tropique (formations in which are found from the first half of the 19th cent.), German -tropisch (formations in which are found from the second half of the 19th cent.), and Swedish -tropisk (formations in which are found from the first half of the 19th cent., e.g. allotropisk allotropic adj.). Compare tropic adj.¹Attested earliest in the first half of the 19th cent. in allotropic adj., an adaptation from either French or German. Formations within English are found from the second half of the 19th cent.; early examples are anisotropic adj., isotropic adj., aeolotropic adj. Chiefly combining with first elements ultimately of Greek origin; for exceptions, compare e.g. galvanotropic adj. at galvanotropism n. Derivatives, viscerotropic adj. at viscero- comb. form 2. With the specific use in epithets of hormones, compare -trophic comb. form, and see discussion at that entry.

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1. Chiefly Botany. Forming adjectives relating to directional movement or growth in response to a stimulus, as geotropic adj., heliotropic adj., phototropic adj., etc.

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2. Physiology. Forming adjectives designating hormones and other agents that act upon a specific organ or tissue, as neurotropic adj., sympathicotropic adj., etc.Usually with parallel formations in -trophic comb. form when designating hormones.

This entry has been updated (OED Third Edition, March 2014; most recently modified version published online September 2018).

单词	-tropic
释义	-tropiccomb. form Primary stress is attracted to the first syllable of this combining form and vowels may be reduced accordingly. Origin: A borrowing from Greek, combined with an English element. Etymons: Greek τροπή , -ic suffix. Etymology: < ancient Greek τροπή act of turning (see trope n.) + -ic suffix. Compare French -tropique (formations in which are found from the first half of the 19th cent.), German -tropisch (formations in which are found from the second half of the 19th cent.), and Swedish -tropisk (formations in which are found from the first half of the 19th cent., e.g. allotropisk allotropic adj.). Compare tropic adj.¹Attested earliest in the first half of the 19th cent. in allotropic adj., an adaptation from either French or German. Formations within English are found from the second half of the 19th cent.; early examples are anisotropic adj., isotropic adj., aeolotropic adj. Chiefly combining with first elements ultimately of Greek origin; for exceptions, compare e.g. galvanotropic adj. at galvanotropism n. Derivatives, viscerotropic adj. at viscero- comb. form 2. With the specific use in epithets of hormones, compare -trophic comb. form, and see discussion at that entry. Categories » 1. Chiefly Botany. Forming adjectives relating to directional movement or growth in response to a stimulus, as geotropic adj., heliotropic adj., phototropic adj., etc. Categories » 2. Physiology. Forming adjectives designating hormones and other agents that act upon a specific organ or tissue, as neurotropic adj., sympathicotropic adj., etc.Usually with parallel formations in -trophic comb. form when designating hormones. This entry has been updated (OED Third Edition, March 2014; most recently modified version published online September 2018). < comb. form
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