The holiday occurring on the last day of the year, December 31st.

Alternative spelling of yeah, right

(idiomatic, emphatic, colloquial) A sarcastic expression of disbelief. / (colloquial, literally) Correct; affirmative; yes; yes, that is correct.

Of an animal or reptile having a yellow underside or belly. / (figuratively) Uncourageous, cowardly.

Synonym of white phosphorus

a year with an extra day, a leap year

The time that it takes for the Sun to return to the same position along the ecliptic, as viewed from the Earth, especially: / A vernal equinox year, the time between two successive vernal equinoxes.

A bright yellow color used for New York taxicabs.

cadmium sulphide when used as a pigment

Operating or continuing throughout the year.