Two words            
May be 2 words combined (fidis+sim) If not obvious, probably incorrect
fid.is               ADJ    1 1 DAT P X POS             
fid.is               ADJ    1 1 ABL P X POS             
fidus, fida, fidum  ADJ   [XXXBX]  
faithful, loyal; trusting, confident;
fid.is               V      3 1 PRES ACTIVE  IND 2 S    
fido, fidere, fisus sum  V (3rd) SEMIDEP   [XXXDX]    lesser
trust (in), have confidence (in) (w/DAT or ABL);
fid.is               N      3 3 GEN S F                 
fid.is               N      3 3 ACC P F                   Early   
fides, fidis  N (3rd) F   [XXXBO]  
fidis                N      3 3 NOM S F                 
fidis                N      3 3 VOC S F                 
fid.is               N      3 3 GEN S F                 
fid.is               N      3 3 ACC P F                   Early   
fidis, fidis  N (3rd) F   [XXXBO]  
chord, instrument string; constellation Lyra; stringed instrument (pl.); lyre;
s.im                 V      5 1 PRES ACTIVE  SUB 1 S    
sum, esse, fui, futurus  V   [XXXAX]  
be; exist; (also used to form verb perfect passive tenses) with NOM PERF PPL
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