a variable star whose brightness variation is irregular.
What Are Irregular Verbs?Verbs (the action words in sentences) are grouped as either regular and irregular, based on whether they follow standard rules of conjugation. Some common irregular verbs include go, have, make, say, take, and know. Regular Verbs To form the past tense of a regular verb, just add -d or -ed to the end of it. For example, learn becomes learned in the past tense. Irregular …
Origin of irregular variable
First recorded in 1900–05
Also called irregular variable star.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019