> as lemmas

c1395 G. Chaucer Squire's Tale 226 The mirour..born was vp vn to the maister tour.

a1500 (?c1450) Merlin 197 Thei lete blowe an horn in the maister toure.

1906 C. M. Doughty Dawn in Brit. I. iii. 121 Set strong guard, Heremod went, Up hastily and Brennus, to their master tower, Builded of great squared stones, with gates of bronze.

1923 Archit. & Building Mar. 23/2 The controlling or master tower is at forty-second street, but the system is such that any tower may be made the master tower.

2006 Broadcasting & Cable 19 June 28/1 The station groups have to decide whether they want to build separate towers, as before, or cooperate on a master tower supporting both stations.