Citrus trees lose some of the developing fruits to prevent the tree from being weighed down by an excessive amount of ripening fruit. Unless your citrus tree has another problem and you are losing fruit in May, June or July, the cause is likely natural and unavoidable.
Noun. 1. noun-a content word that can be used to refer to a person, place, thing, quality, or action. content word, open-class word-a word to which an independent meaning can be assigned. substantive-any word or group of words functioning as a noun.
Updated April 12, 2017. A count noun is a noun that refers to an object or idea that can form a plural or occur in a noun phrase with an indefinite article or with numerals. Contrast with mass noun (or noncount noun). Most common nouns in English are countable--that is, they have both singular and plural forms.