Sentence:  The articulatory description of <WSD>rhotic</WSD> diphthongs and triphthongs involves the onglide vowel followed by the <WSD>rhotic</WSD> or r-colored offglide. 
Meaning of the word marked with <WSD> tags:  Having a sound quality associated with the letter R; having the sound of any of certain IPA symbols, including (/ɹ/), (/ɻ/), (/ɚ/), (/ɝ/) and (/r/).