The Collaborative International Dictionary of English v.0.48:

Arthrospore \Ar"thro*spore\, n. [Gr. ? joint + E. spore.]
   (Bacteriol.)
   1. A bacterial resting cell, -- formerly considered a spore,
      but now known to occur even in endosporous bacteria.
      [Webster 1913 Suppl.]

   2. one of the small conidia occurring arranged in chains in
      certain fungi. Called also oidium.
      [PJC] -- Ar`thro*spor"ic, Ar*thros"po*rous, a.
      [Webster 1913 Suppl.]

The Collaborative International Dictionary of English v.0.48:

arthrosporous \arthrosporous\ adj.
   1. of or pertaining to an arthrospore[2].

   Syn: arthrosporic
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

arthrosporous
    adj 1: of or relating to arthrospores [syn: arthrosporic,
           arthrosporous]