ˈunder-sect (under-1 6 b.) 1653Jer. Taylor Serm. for Year i. xxii. 277 The whole religion which..hath been rent into innumerable sects, and under-sects.1682T. Flatman Heraclitus RidensNo. 65, What the Under-sects might have claim'd upon the score of their wanting Opportunity only..to do Mischief.