birdwatch noun 1verb 1forms 3 noun1 •A session of observing and identifying birds.Some students can stake out a square of earth in a flowerbed and keep track of what comes up; others can start a birdwatch recording the numbers and kinds of birds they see. — 1983 verb1 •To take part in birdwatching; to observe and identify birds. formsbirdwatched · birdwatching · birdwatches