光期性 guāngqīxìng photoperiodism Definitions Defs Origin Strokes Stroke Words Sentences Sents 光 guāng noun light light; ray; beam of light期 qī noun period A designated period of time, phase, or stage; also refers to a scheduled date or deadline性 xìng affix [-ity] Suffix used after verbs or adjectives to form nouns expressing a state, quality, or scope, similar to English "-ity", "-ness", or "-ism".
