The Collaborative International Dictionary of English v.0.48:

Metrical \Met"ric*al\, a.
   1. Of or pertaining to the meter; arranged in meter;
      consisting of verses; as, metrical compositions.
      [1913 Webster]

   2. Of or pertaining to measurement; as, the inch, foot, yard,
      etc., are metrical terms; esp., of or pertaining to the
      metric system.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Algometer \Al*gom"e*ter\, n. [Gr. ? pain + -meter.] (Psychol.)
   An instrument for measuring sensations of pain due to
   pressure. It has a piston rod with a blunted tip which is
   pressed against the skin. -- Al*gom"e*try, n. --
   Al`go*met"ric, *met"ric*al, a. -- Al`go*met"ric*al*ly,
   adv.
   [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

metrical
    adj 1: based on the meter as a standard of measurement; "the
           metric system"; "metrical equivalents" [syn: metric,
           metrical]
    2: the rhythmic arrangement of syllables [syn: measured,
       metrical, metric]