a·pe·ri·od·ic 
(ā′pîr-ē-ŏdĭk)
(ā′pîr-ē-ŏdĭk)adj.
Occurring without periodicity; irregular.
a′pe·ri·odi·cal·ly adv.
a·pe′ri·o·dici·ty (-ə-dĭsĭ-tē) n.
- crossfire
- cross-grained
- cross hair
- crosshair
- crosshatch
- cross-hatching
- crosshead
- cross-index
- crossing
- crossing over
- crossing-over
- cross-legged
- cross-link
- crossly
- cross matching
- cross mind
- cross multiplication
- cross-multiply
- cross-national
- crossness
- cross (one's) mind
- cross one's mind
- cross (one's) t's
- cross one's t's
- crossopterygian