漢：形容詞和名詞后綴，形容詞后綴-ful意為"full of,having the quality of"。多加在名詞之后表示“充滿...的、易于...、可...的、富有...的、具有...的”的意思，是最常用的形容詞后綴，反義詞后綴是-less；此外，加在名詞 之后，表示充滿的量。 英：word-forming element meaning "full of, characterized by," Old English -full, -ful, suffix use of full (adj.). -fula suffix meaning “full of,” “characterized by” ( shameful; beautiful; careful; thoughtful ); “tending to,” “able to” ( wakeful; harmful ); “as much as will fill” ( spoonful ). Origin: Middle English, Old English -full, -ful, representing full, ful full1 Usage note The plurals of nouns ending in -ful are usually formed by adding -s to the suffix: two cupfuls; two scant teaspoonfuls. Perhaps influenced by the phrase in which a noun is followed by the adjective full ( both arms full of packages ), some speakers and writers pluralize such nouns by adding -s before the suffix: two cupsful. World English Dictionary -ful — suffix 1. ( forming adjectives ) full of or characterized by: painful ; spiteful ; restful 2. ( forming adjectives ) able or tending to: helpful ; useful 3. ( forming nouns ) indicating as much as will fill the thing specified: mouthful ; spoonful usage Where the amount held by a spoon, etc, is used as a rough unit of measurement, the correct form is spoonful , etc: take a spoonful of this medicine every day . Spoon full is used in a sentence such as he held out a spoon full of dark liquid , where full of describes the spoon. A plural form such as spoonfuls is preferred by many speakers and writers to spoonsful Medical Dictionary -ics suff. Science; art; study; knowledge; skill: pharmaceutics. Actions, activities, or practices of: macrobiotics.