-tacticcomb. form

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

Origin: A borrowing from Greek. Etymon: Greek τακτικός.

Etymology: < ancient Greek τακτικός of or relating to arrangement, specifically in military context (see tactic adj.¹). Compare German -taktisch . Compare -taxis comb. form.Formations are found from the last quarter of the 19th cent., apparently earliest in phototactic adj. (after a German model) and chemotactic adj. (modelled on a noun in -taxis comb. form). Earlier borrowed words ultimately showing ancient Greek τακτικός as their second element, and also formations showing tactic adj.¹ as their second element, are found in a variety of subject fields, e.g. diatactic adj., syntactic adj., phyllotactic adj. Ancient Greek τακτικός is used in combination with a number of prefixes, in ancient Greek (in e.g. ἐπιτακτικός epitactic adj.) and Hellenistic Greek (in e.g. διατακτικός diatactic adj.).

Biology.

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Forming adjectives designating or relating to the directional movement of a motile cell, organism, etc., in response to a stimulus indicated by the first element, as chemotactic adj., phototactic adj., etc. Frequently corresponding to nouns in -taxis comb. form.

This is a new entry (OED Third Edition, November 2010; most recently modified version published online September 2018).

单词	-tactic
释义	-tacticcomb. form Primary stress is attracted to the first syllable of this combining form and vowels may be reduced accordingly. Origin: A borrowing from Greek. Etymon: Greek τακτικός. Etymology: < ancient Greek τακτικός of or relating to arrangement, specifically in military context (see tactic adj.¹). Compare German -taktisch . Compare -taxis comb. form.Formations are found from the last quarter of the 19th cent., apparently earliest in phototactic adj. (after a German model) and chemotactic adj. (modelled on a noun in -taxis comb. form). Earlier borrowed words ultimately showing ancient Greek τακτικός as their second element, and also formations showing tactic adj.¹ as their second element, are found in a variety of subject fields, e.g. diatactic adj., syntactic adj., phyllotactic adj. Ancient Greek τακτικός is used in combination with a number of prefixes, in ancient Greek (in e.g. ἐπιτακτικός epitactic adj.) and Hellenistic Greek (in e.g. διατακτικός diatactic adj.). Biology. Categories » Forming adjectives designating or relating to the directional movement of a motile cell, organism, etc., in response to a stimulus indicated by the first element, as chemotactic adj., phototactic adj., etc. Frequently corresponding to nouns in -taxis comb. form. This is a new entry (OED Third Edition, November 2010; most recently modified version published online September 2018). < comb. form
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