Source : Webster's Revised Unabridged Dictionary (1913)

Bacteroid \Bac"te*roid\, Bacteroidal \Bac`te*roid"al\, a.
   [Bacterium + -oid.] (Biol.)
   Resembling bacteria; as, bacteroid particles.

Source : WordNet®

bacteroidal
     adj : resembling bacteria [syn: {bacteroid}, {bacterioidal}, {bacterioid}]