The term 'prefix with logical' refers to a set of words that all begin with the same prefix and have a logical meaning. The crossword solutions for this term are GEO (3 letters), NEURO (5 letters), IDEO (4 letters), TELEO (5 letters), ECO (3 letters), THEO (4 letters), SOCIO (5 letters), ASTRO (5 letters), and CHRONO (6 letters). GEO refers to geography, NEURO to neurology, IDEO to ideas, TELEO to teleology, ECO to ecology, THEO to theology, SOCIO to sociology, ASTRO to astronomy, and CHRONO to chronology. All of these words have a logical meaning related to their prefix and can be used to complete the crossword puzzle.