-tactic

adj combining form

having a specified kind of pattern or arrangement or having an orientation determined by a specified force: syndiotactic; phototactic.

[from Greek taktikos relating to order or arrangement; see tactics]

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

tac•tic

(ˈtæk tɪk)

n.

1. tactics (def. 1).

2. a system or a detail of tactics.

3. a plan, procedure, or expedient for promoting a desired end.

adj.

4. of or pertaining to arrangement or order; tactical.

[1560–70; < New Latin tacticus < Greek taktikós fit for arranging or ordering =tag-, base of tássein to arrange, put in order + -tikos -tic]

-tactic

-taxic

a combining form used in adjectives that correspond to nouns ending in -taxis: stereotactic.