INTERCALARY (Lat. intercalare, to proclaim), a term applied to a month, day or days inserted between other months or days in order to adjust the reckoning of time, to the revolution of the earth round the sun, the solar year (see CALENDAR). From the meaning, "something placed between," intercalary is used for something which comes between two types. In botany, the term is used of growth between the apex and base of an organ, such as the growth in length of an iris leaf, or of the internode of a grass-haulm.