-ing
EN
[ɪŋ] [ɪn] [ən] [iːn] [iːŋ] W-ing
- -ing is a suffix used to make one of the inflected forms of English verbs. This verb form is used as a present participle, as a gerund, and sometimes as an independent noun or adjective.
- What parallels the usages of present participles as adjectival or adverbial phrases is that past participles can also be used as adjectives or adverbs, but not as nouns.
FR -ing 
- SuffixSUF-ing
- Used to form gerunds, a type of verbal nouns, from verbs.
- the making of the film; the forging of the sword took several hours of planning, preparation, and metalwork
- Used to form uncountable nouns from various parts of speech denoting materials or systems of objects considered collectively.
- Roofing is a material that covers a roof.
- Piping is a system of pipes considered collectively.
- Used to form present participles of verbs.
- Rolling stones gather no moss.
- You are making a mess.
- Forming derivative nouns (originally masculine), with the sense ‘son of, belonging to’, as patronymics or diminutives. No longer productive in either sense.
- Browning, Channing, Ewing
- bunting
- shilling
- farthing
- Having a specifed quality, characteristic, or nature; of the kind of.
- sweeting
- whiting
- gelding
- Used to form gerunds, a type of verbal nouns, from verbs.
- More Examples
- Used in the Middle of Sentence
- The purpose of the tramper is to pack the lint into the press box under the restraining dogs near the top end of the press box.
- Used in the Middle of Sentence
Definition of -ing in English Dictionary
- Part-of-Speech Hierarchy
- Morphemes
- Suffixes
- Inflectional suffixes
- Noun-forming suffixes
- Inflectional suffixes
- Suffixes
- Morphemes
- fr -ing
Source: Wiktionary
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Grammatically, this word "-ing" is a morpheme, more specifically, a suffixe.