(organic chemistry) The xanthophyll (1R,2R)-4-[(1E,3E,5E,7E,9E,11E,13E,15E,17E)-18-[(4R)-4-hydroxy-2,6,6-trimethylcyclohexen-1-yl]-3,7,12,16-tetramethyloctadeca-1,3,5,7,9,11,13,15,17-nonaenyl]-3,3,...

plural of tekke

Having two sides. / Involving both sides equally. / (of an agreement) Binding on both of the two parties involved. / Having bilateral symmetry.

(mining) A prop supporting a platform in a mine.