-atory

suffix forming adjectives meaning 'relating to or involving (a verbal action)' (amatory; explanatory; predatory). See also -ORY(2).
Etymology: L -atorius

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\\əˌtōrē, -tȯr-, -ri; esp Brit ətəri or ə.tri or sometimes when an unstressed syllable precedes |ātəri or |ā.tri\ adjective suffix

Etymology: Middle English, from Latin -atorius, from -atus -ate + -orius -ory

: of, belonging to, or connected with

perspiratory

: serving or tending to

amendatory

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a combination of -ate¹ and -ory¹ or -ory², used infrequently as an independent suffix with the same senses as -ory¹ and -ory²: affirmatory; observatory.

[ < L -atorius, -a, -um, orig. the termination of adjectives formed with -torius (see -TORY¹, TORY²) and verbs whose stems ended in -a-; reanalyzed in English in the same way as -ATOR]

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suffix (forming adjectives) relating to or involving an action

explanatory | predatory

Origin:

from Latin -atorius