plural of counterful

(ethology, of a bird) To sing in response to the song of another

Third-person singular simple present indicative form of countersing

Third-person singular simple present indicative form of counterseal

present participle of counterseal

(transitive) To seal or ratify with another or others.

An additional seal applied to the reverse of the main seal.

simple past tense and past participle of counterseal