external.1a.a(Uillinn) sheachtrach. Med: For external application, le cur ar an gcneas. bLasmuigh, forimeallach, imeallach. External walls, na ballaí lasmuigh. cBiol: Eismheánach. 2s. (Usu. in pl.) An taobh m amuigh. Judging by externals, de réir dealraimh, de réir cosúlachta. ►externally, adv.Go seachtrach; ar an taobh amuigh; de réir dealraimh.