'Microscopical' definitions:

Definition of 'microscopical'

From: WordNet
adjective
Of or relating to or used in microscopy; "microscopic analysis"; "microscopical examination" [syn: microscopic, microscopical]
adjective
Visible under a microscope; using a microscope [syn: microscopic, microscopical]
adjective
So small as to be invisible without a microscope; "differences were microscopic" [syn: microscopic, microscopical]

Definition of 'Microscopical'

From: GCIDE
  • Microscopic \Mi`cro*scop"ic\, Microscopical \Mi`cro*scop"ic*al\, a. [Cf. F. microscopique.] [1913 Webster]
  • 1. Of or pertaining to the microscope or to microscopy; made with a microscope; as, microscopic observation. [1913 Webster]
  • 2. Able to see extremely minute objects. [1913 Webster]
  • Why has not man a microscopic eye? --Pope. [1913 Webster]
  • 3. Very small. Specifically, visible only by the aid of a microscope; as, a microscopic insect; also used figuratively; as, a microscopic advantage. [1913 Webster +PJC]